Main definitions of core in US English:

: core1CORE2



  • 1The tough central part of various fruits, containing the seeds.

    ‘quarter the pears, remove the cores then slice again into wedges’
    • ‘Sam got up from her seat to throw out her apple core.’
    • ‘Cut the fennel from top to root into thin slices and cut out the tough core.’
    • ‘Using an apple corer, scoop out the cores from the apples.’
    • ‘Cut out the tough core, and slice the leaves in thin strips - a food processor would come in handy.’
    • ‘Johnny Appleseed planting apple trees across America with his discarded apple cores is another legend.’
    • ‘It were as if thoughts shared whilst freewheeling down a country lane existed for just those few shameless moments, then could be thrown away, to decay in the hedgerows like the discarded cores of forbidden fruit.’
    • ‘Cut the core, seeds and white membranes from the capsicum and cut into chunks.’
    • ‘I told you again that you were the reason Adam ate the apple and its core.’
    • ‘Magnus shrugged as he took a last bite of the apple and twirled the core by the stem.’
    • ‘The seed cores were removed from the peppers which were then roughly torn into pieces.’
    • ‘Then cut in quarters, remove the cores and seeds.’
    • ‘Not only does it have a paper bank which it has encouraged the whole village community to use, but it also makes its own compost, using the apple cores left over from the children's five-a-day fruit campaign.’
    • ‘The absence of a core in the picked fruit makes raspberries softer and juicier to eat than blackberries.’
    • ‘Cut the peppers in half, discard the core and seeds, and slice each half into long, thin fingers.’
    • ‘Grate the unpeeled apples, discarding core and seeds.’
    • ‘Cut four ‘sides’ from each pepper and discard the central core and seeds.’
    • ‘The young woodland contains apple, pear and plum trees - all grown, Gordon says, from seeds and cores dropped by visitors, and all tested recently and found to be clear of pollutants.’
    • ‘With a paring knife, cut out the tough core and any bits of hard matter surrounding it.’
    • ‘Halve the peppers lengthways, tear out and discard the white core and seeds then lay the peppers cut-side up in a baking dish.’
    • ‘Slice the courgette and aubergine lengthwise and cut the peppers in four, discarding the core and seeds.’
  • 2The central or most important part of something.

    1. 2.1often as modifier The part of something that is central to its existence or character.
      ‘the plan has the interests of children at its core’
      ‘managers can concentrate on their core activities’
      heart, nucleus, nub, hub, kernel, marrow, meat
      central, key, basic, fundamental, elemental, principal, primary, main, chief, crucial, vital, essential
      View synonyms
    2. 2.2 An important or unchanging group of people forming the central part of a larger body.
      • ‘I fancy Birmingham to stay up, a well run club with a core of quality players and more squad depth than most in their position.’
      • ‘The core of the steering committee is around 35 - the same group of people since just after the coup d'état and we form a very strong block.’
      • ‘The good news is the Primorsky pressure to block such action should have now stopped, along with the resignation of the governor and the core of his team.’
      • ‘He admits that the opportunity to work with Ross again was also important, allowing them to form the core of an executive team that was already up to speed with each other's working methods.’
      • ‘Assessing the performance of employees who form the core of any organisation, through a well-defined system, is probably the easiest way to achieve this goal.’
      • ‘They are the core of any alternative government, and it's important that that alternative is able to be properly presented to the electorate.’
      • ‘But McGurk's expertise has helped keep the central core of the team strong although he is keen to scratch out a few more clean sheets.’
      • ‘Pollsters and strategists have replaced volunteers and unpaid staff as the core of many state legislative campaign organizations.’
  • 3The dense central region of a planet, especially the nickel–iron inner part of the earth.

    • ‘It may also be in part caused by vigorous chemical interaction between the silicate mantle and the iron core.’
    • ‘In fact, it has proportionately more iron in it and a bigger core than does the Earth.’
    • ‘In time, seismograph recordings enabled geologists to determine that Earth has a dense core surrounded by a slowly flowing mantle and a thin outer crust.’
    • ‘The scientists compared the time it took seismic waves generated by nearly identical earthquakes to travel through the Earth's inner core.’
    • ‘If this process persists, the planet could be stripped to its dense core in a few billion years.’
    • ‘Hot dense matter is in every star and supernova; warm dense matter pervades the cores of large planets like Jupiter and occurs transitionally when a material goes from solid to plasma.’
    • ‘Magnetic fields, which are produced by the dynamo effect caused by spinning liquid iron, such as the core of a planet, are found throughout the universe.’
    • ‘In the science journal Nature, scientists have now stated that they have confirmed the presence of a vortex in the Northern Hemisphere deep underground in the earth's molten iron inner core.’
    • ‘The world is coming to an end because of a dud military experiment and a few brave men and a woman must go boldly into the core of the earth to save the planet.’
    • ‘The Earth has an iron core surrounded by a dense layer called the mantle, which is capped with a thin rind of rocky crust.’
    • ‘Scientists believe the magnetic field is generated deep inside the Earth where the heat of the planet's solid inner core churns a liquid outer core of iron and nickel.’
    • ‘The planet's electromagnetic field is decaying due to the outer core of the Earth, itself a ball of trillions of tons of liquid metal, having stopped moving.’
    • ‘The earth's rotation and convection is supposed to circulate the molten nickel/iron of the outer core.’
    • ‘As far as I understand it: The two planetary embryos that collided to form the Moon would have already undergone differentiation, sending most of their iron/nickel to their respective cores.’
    • ‘The core is divided into two layers: the liquid outer core and - at the Earth's center - the solid iron inner core.’
    • ‘Jupiter and Saturn would form in less time than Uranus or Neptune, but Uranus and Neptune's planet cores would probably not have sufficient mass to reach their present size.’
    • ‘Finally, fluid currents in the Earth's inner core can change the rotation of the planet.’
    • ‘Most modern calculations rely on the fact that we believe the inner core to be made up of iron and nickel that is just about at melting point.’
    • ‘Sulfur is iron-loving, so it likes to reside in the iron core of a planet.’
    • ‘And yet scientists have a good idea of when the Earth formed, how quickly the iron core settled to the center of the planet, when oceans began to appear, and so on.’
    centre, interior, middle, nucleus, bosom
    View synonyms
    1. 3.1 The central part of a nuclear reactor, which contains the fissile material.
      • ‘More than a quarter of the core is severely fire-damaged and contains around 15 tonnes of nuclear fuel, some of which melted inside the core.’
      • ‘The screens variously arranged around the room gave off an eerie dim blue glow, the type of glow seen in a nuclear reactor core during meltdown.’
      • ‘They maintain that the fissile cores are stored separately from the non-nuclear explosives packages, and that the warheads are stored separately from the delivery systems.’
      • ‘This generator is a small pellet of polonium and beryllium, separated by foil within the fissionable fuel core.’
      • ‘In the film, plant operators rely on an erroneous reading from a malfunctioning meter to gauge the water level used to cool the nuclear core.’
      • ‘But diplomats close to the agency said it appeared to be a design for the core of a nuclear warhead.’
      • ‘But now, there is a leak in the nuclear core and the only way to fix it is to send a number of men into the radiation chamber, making them very likely to die.’
      • ‘Nine seconds later, 69 boron rods smash down into the hot core of unit two, a nuclear reactor on Three Mile Island.’
      • ‘Radiation was released, a part of the nuclear core was damaged, and thousands of residents evacuated the area.’
      • ‘The heart of any nuclear reactor is the core, which contains the fuel, a moderator, and control rods.’
      • ‘The fuel in the reactor core consists of several tons of uranium.’
      • ‘The containment structure is designed to prevent the release of radioactive materials in case of an accident within the reactor core.’
      • ‘We simply have to follow safety procedures when it comes to flushing reactor cores of waste materials.’
      • ‘In order to prevent such a disaster, the reactor core also contains control rods.’
      • ‘These were irradiated in the core of the nuclear reactor Siloe, Centre d'Etudes Nucleaires de Grenoble, France.’
      • ‘The whining pitch of the nuclear cores heightened to a point where the team of soldiers out there dropped their weapons and held their hands over their ears in intense agony.’
      • ‘Within the core of nuclear reactors, a transmutation-process goes through the sequence of the outer planet-names.’
      • ‘One by one, the old reactors can be pulled and the fuel rods disposed of as at present the residual heat left in the radioactive cores is closely monitored by the skilled nuclear engineers operating the new reactor for the next 40 years.’
      • ‘They've done everything but put the fissile core in it.’
      • ‘Laird was thus able to demonstrate that the support systems around the radioactive core could cope with the most difficult of accident conditions - loss of coolant.’
    2. 3.2 A tiny ring of magnetic material used in a computer memory to store one bit of data, now superseded by semiconductor memories.
      • ‘The core clock speed and memory interface speeds of the slower cards have yet to be determined, according to the spokesman.’
      • ‘Presently, John was shouting for two technicians to calm down while simultaneously filing digital signals to the computer core.’
      • ‘Computer cores have been increasing in speed, and increasingly quickly.’
      • ‘A bus interface enabling communication over a bus between the memory core of the display controller and the microprocessor is included.’
      • ‘The core and the graphics memory have synchronous clocking equal to 175MHz.’
      • ‘Let's see if I can run the benchmark with my core and memory running 5MHz faster.’
      • ‘OCGuru allows you to adjust the voltages for both the core and memory, within safe limits, of course.’
      • ‘Naturally both cards had some reserves left in terms of performance by increasing the clockspeed of both the core and the memory.’
      • ‘With those gone, I sever the wires that connect the disk drive to my memory core.’
      • ‘In a multicore design, it also lets all the cores share the memory controller which adds another incremental benefit.’
      • ‘The 5U ‘low-end’ system with 96 cores and 32GB of memory will start at $89,000.’
      • ‘When we moved both the core and memory to the max OC, the tests failed.’
      • ‘It was a gigantic application of the first generation of high-speed computers with magnetic core memories.’
      • ‘These future innovations include dual processing cores, embedded memory, and software, he said.’
      • ‘Overclocking was somewhat limited given the high clock speeds of the core and memory.’
      • ‘The core connects to video memory across a 256-bit bus.’
      • ‘Engineering; go and reboot the computer cores.’
      • ‘The graphics core uses shared system memory, of which there will be 128MB.’
      • ‘In some circumstances the system will prompt you to reboot at that point so it can detect the default core and memory speeds of your card.’
      • ‘With the same core and memory speeds, both cards are virtually identical in performance.’
    3. 3.3 The inner strand of an electrical cable or rope.
      • ‘Similarly, bringing together the ends of two cables is simple unless those cables have a core diameter many times smaller than a human hair, as is the case with fiber optics.’
      • ‘Sharks have been known to decide to bite them, there were worms called Teredo worms, which used to like to eat the gutta percha, which was used to insulate the copper wire at the core of the cable.’
      • ‘Inner core was jointed to the outer mesh with non-conductive fishing line, and everything was held together with old-fashioned duct tape.’
      • ‘The smaller the core and the poorer electrical conductor its material was, the faster the field would decay.’
    4. 3.4 The muscles of the torso, especially the lower back and abdominal area, which assist in the maintenance of good posture, balance, etc.
      ‘nothing will strengthen your core like balancing a heavy barbell on your back or lifting one off the floor’
      as modifier ‘the core muscles of the abdomen’
      • ‘The concept behind stabilization is to work the body's core to improve its function in daily life and reduces the risk of injury.’
      • ‘Your posture will also improve as your core becomes stronger; causing you to stand straighter and taller, and giving you a longer, leaner, more streamlined appearance.’
      • ‘Take a pilates or yoga class, an excellent way to unwind and build core muscles.’
      • ‘Using the exercise ball is also a great way to train your core muscles.’
      • ‘In a little less than 10 minutes, you can strengthen your lower back and improve your core development with one of our workouts below.’
      • ‘Plus he does core work, which focuses on the midsection and helps reduce lower-back injuries - an important precaution for firefighters.’
      • ‘Even when you are lifting weights, exercises like the free squat will demand that you develop strong core muscles.’
      • ‘It was just a matter of working with his body, strengthening his core and his legs to build up his endurance and improve his balance.’
      • ‘Athletes who are involved in track and field also need to work their core muscles, since they are recruited in running, throwing and jumping.’
      • ‘The first five of the 19 exercises target that area directly, and all 19, particularly those that incorporate a Swiss ball, will work your core to some extent.’
      • ‘Push-ups strengthen the chest and the triceps and stabilize the core as you hold your body in a plank position.’
      • ‘The best way to strengthen the core is with a series of exercises using an oversized ball.’
      • ‘Try using a Swiss ball for some of your core exercises and keep your core engaged when lifting weights.’
      • ‘In aerial work, even more than in dance, building core strength is primary for stability and protecting the lower back.’
      • ‘Push your abs out and wear a weightlifting belt (this will strengthen your core).’
      • ‘Under Reese's guidance, Hansen focuses intently on building core strength and complementing the building of muscle strength with the maintenance of flexibility.’
      • ‘"When your core is stronger you can control your body better, and you'll improve your kinesthetic awareness," states Riegel.’
    5. 3.5 A piece of soft iron forming the center of an electromagnet or an induction coil.
      • ‘The stator assembly consists of independently controlled electromagnet cores that are both identical and isolated from each other, and made of soft, magnetic composites.’
    6. 3.6 An internal mold filling a space to be left hollow in a casting.
      • ‘A casting would require a pattern, a core, a mold, and finally casting the part from aluminum.’
    7. 3.7 A cylindrical sample of rock, ice, or other material obtained by boring with a hollow drill.
      • ‘Sediment cores obtained throughout the region show that dune fields have been active over broad areas for several periods in the past 3,000 years.’
      • ‘The block samples were obtained following ongoing excavation of the quarry floor, and the core samples by diamond drilling below the quarry floor.’
      • ‘Geotechnical Engineering tests were performed on rock cylindrical cores, and irregular lumps of the four selected grades.’
      • ‘Ships may also carry huge deep-sea drills that pull cores of sediment and rock from the beneath the ocean.’
      • ‘She also has participated in the collection and processing of paleomagnetic drill cores from basalt flows in Iceland.’
      • ‘The success of these various techniques is limited by the expense and feasibility of collecting cores and processing core samples.’
      • ‘Ice cores have been drilled at several places in the Antarctic, including the research outposts at Vostok and Byrd Station.’
      • ‘And there's an instrument on board Beagle 2 called the mole and the mole will burrow under the soil and the drill will take a drill core from a rock.’
      • ‘In total, 29 of the 88 cores drilled during leg 118 were imaged using the DMT corescan system.’
      • ‘One of the best ways is to drill ice cores, often stupendously long ones.’
      • ‘In addition, readily available cylindrical rock cores cannot be tested using this system.’
      • ‘The team drilled beneath the ground to take sample cores from up to 165 metres beneath the surface.’
      • ‘It is claimed that samples of Antarctic ice cores show that the current CO2 level in the atmosphere is at its highest for almost 500,000 years.’
      • ‘SD2 will drill for small cores of ice and dust from depths of down to 250 millimetres.’
      • ‘As these shelves grew equatorward the primary source of water vapour for snow formation was moved farther away from continental ice sheets where ice cores were later drilled.’
      • ‘We have obtained and analyzed cores of varved sediments from Cheakamus, Green, and Glacier lakes.’
      • ‘Chicxulub drill cores reveal that the target rocks contain hydrocarbons, the vaporization of which could produce soot.’
      • ‘Over the past decade we have drilled ice cores on domes for a variety of reasons, and this dome is the first thing I notice when looking at the surface topography map.’
    8. 3.8Archaeology A piece of flint from which flakes or blades have been removed.
      • ‘Visiting relatives, dignitaries, or pilgrims would return home bearing cache blades, cores, and bladelets made from Flint Ridge flint.’
      • ‘Hopewellian chert tool industries consist of three discrete manufacturing trajectories, resulting in tools made on cores, flakes, and blades.’
      • ‘A piece of flint struck from a core which characteristically shows traces of the processes of removal: concentric fracture ripples and a bulb of percussion.’
      • ‘They dispose of used tools and debitage carefully, out of the way of bare feet, or, in the case of unused pieces and sizeable cores, where they may find them again.’
      • ‘The flint consisted of cores, chippings and unfinished tools, indicating that tools were made on site.’
      • ‘Rather than the simple working of flint cores found in earlier phases, where flaking would proceed in an ad hoc fashion, Levallois was a technique that shaped the core to predetermine the size and form of the resulting flakes.’
      • ‘The vast majority of chert tools found at Hopewell sites are not made from blades, but from reduction flakes derived from multidirectional cores.’
  • 4Economics
    as modifier Denoting or relating to a figure for inflation that excludes certain items, chiefly food and energy, that are subject to sudden and temporary price fluctuations.

    ‘core inflation was up 2.3 percent over the 12 month period’
    Compare with headline (sense 2 of the noun)
    • ‘We took the economy from the double-digit inflation of the late 1970s to a core inflation rate in the two-to-three percent range.’
    • ‘Of more interest to central bankers will be core inflation figures next Friday, which the institution watches closely.’
    • ‘Despite significant increases in the headline inflation, core inflation remains low.’
    • ‘The latest data matches the December 2001 low for core inflation.’
    • ‘The yearly core inflation rate now stands at 2.4%, double the pace at this time last year.’


[with object]
  • Remove the tough central part and seeds from (a fruit)

    ‘peel and core the pears’
    • ‘Jim noted that inventor Boyle must have had trouble with his morning grapefruit, since in addition to this corer, he patented three other grapefruit coring devices in the next nine years.’
    • ‘For apple pie flavor without the fat-filled crust, stuff cored apples with brown sugar, cinnamon and granola (a sneaky bit of fiber), then cover and bake at 350 degrees for 45 minutes.’
    • ‘Try this Austrian remedy for mental fatigue: Chop a washed, cored apple into small pieces.’
    • ‘Arrange some delicious apples that have been cored, peeled and sliced over the top of the butter sugar mixture and cook over med heat for 15 mins or until a syrup forms.’
    • ‘For speed, use the peeled, cored fresh pineapples from the produce section.’
    • ‘The pears are peeled and cored - remove from the base with a melon baller, but keep the stalks on, as they will look pretty.’
    • ‘You'll find this pineapple corer in many cookware stores; it comes with one or three coring units, each geared to specific fruit sizes.’
    • ‘Votives and tea lights can be popped into old teacups, apples can be cored to hold a taper candle, or you can just set pillars and votives on top of an old wall mirror or picture frame used as a tray!’
    • ‘All the breakfasts are served with a healthy arrangement of fresh fruit - bananas, melon, and to top it all off, a baked, cored half apple with a little dollop of cream.’
    • ‘Before I left for Costa Rica, I bought a Del Monte Gold, skinned its prickly bark, cored its hard center, and ate it with my fingers.’
    • ‘Glancing up and setting the fourth cored apple aside, Lydia said, ‘Stuffed apples.’’
    • ‘In a blender, mix one tbsp of honey with one peeled and cored apple.’
    • ‘In some areas, the apples were cored and sliced into rings, which were dried by stringing the slices on a pole.’
    • ‘You'll need a 2-pound pineapple or 1 1/4-pound peeled, cored pineapple.’


  • to the core

    • 1To the depths of one's being.

      ‘she was shaken to the core by his words’
      • ‘After the last note faded away, the audience was still, shaken to the core.’
      • ‘Soaked through with sweat and shaken to the core, I faced my first few classes in a traumatised daze.’
      • ‘Two years ago last week, Standard Life Bank arrived on the scene and shook the banking market to the core.’
      • ‘But the meeting had shaken Damon to the core and had made him remember his own longing for Death.’
      • ‘The information from Boston about his ancestor had shaken him to the core.’
      • ‘There's a horrible, ringing finality to his words that shakes me to the core.’
      • ‘I really feel for the Dutch people, and know that this murder must have shaken them to the core.’
      • ‘Ultimately, he found his way back to Athens, but his NYU stint was not to be, and he was shaken to the core.’
      • ‘He was even convinced that her only friend in the entire city was her agent, something that had shaken her to the core.’
      • ‘The cremation of the royal remains was therefore a catastrophe that shook Malagasy society to the core.’
      1. 1.1Used to indicate that someone possesses a characteristic to a very high degree.
        ‘he is a politician to the core’
        • ‘I speak not as a partisan or an opponent of any man or measure, when I say that our politics are rotten to the core.’
        • ‘On Ghantasala, she said the singer was a perfectionist to the core.’
        • ‘Fay and Dave seemed to have the perfect relationship - they were in love to the core and always had been.’
        • ‘The whole system of government procurement is utterly corrupt to the core.’
        completely, totally, absolutely, entirely, wholly, fully, thoroughly, quite, altogether, one hundred per cent, downright, outright, unqualifiedly, in all respects, unconditionally, perfectly, implicitly, unrestrictedly, really, veritably, categorically, consummately, undisputedly, unmitigatedly, wholeheartedly, radically, stark, just, to the hilt, to the core, all the way, to the maximum extent, extremely, infinitely, unlimitedly, limitlessly, ultimately
        View synonyms


Middle English: of unknown origin.




Main definitions of core in US English:

: core1CORE2



  • Congress of Racial Equality.