Definition of twin in English:



  • 1One of two children or animals born at the same birth.

    • ‘This is the first time that surgeons have tried to separate adult craniopagus twins - siblings born joined at the head.’
    • ‘Grace and her twin brother Billy are believed to be the smallest surviving set of twins ever born at Southend Hospital after coming into the world four months early.’
    • ‘Burt claimed to have studied fifty-three pairs of identical twins separated at birth and reared in different environments, and to have found that their IQs were very similar.’
    • ‘Siamese twins are identical twins who develop with a single placenta from a single zygote.’
    • ‘Ten years before I was born, following the birth of the twins, she was very very ill, and as the family mythology goes the doctors told her not to have any more children.’
    • ‘A woman was not given basic health checks for two-and-a-half hours giving birth to twins at a top private hospital, an inquest was told.’
    • ‘A mother had to be flown to a Norwich hospital to give birth to identical twins because there were not enough incubators at Southend's premature baby unit.’
    • ‘Jesse and William, identical twins, were born two years later, and Tyrelle, two years after them.’
    • ‘The twins were born a year and a half after their brother.’
    • ‘On January 13, Rowland had given birth to twins, one of which had been stillborn, while the other, a girl, lived and has since been adopted.’
    • ‘Born as identical twins in Wales, they grew up in the UK with a mother with major mental illness and a shared history of abuse.’
    • ‘Nearly 10,000 multiple births were recorded last year in the UK, and one in 35 children is now born as a twin, while triplet births have quadrupled in many countries.’
    • ‘When my own twins were born, several things happened.’
    • ‘Her mother died after giving birth to twins, her brother and her.’
    • ‘Before routine electronic ultrasound scans and foetal monitors were introduced almost half of twins born to mothers in Ireland were unexpected.’
    • ‘The birth of twins usually goes smoothly, with both born head down.’
    • ‘The twins were born in April, yellow-haired like Quintus's brothers.’
    • ‘Now, tell me if you think I am wrong, but, if it wasn't for the fact that Cameron is nearly a decade older, they look like identical twins separated at birth!’
    • ‘The Comedy of Errors features two sets of identical twins, separated at birth, who end up in the same town on the same day.’
    • ‘A study of identical and fraternal twins separated at birth and adopted into different families showed the same heritability.’
    identical twins, non-identical twins, fraternal twins
    View synonyms
    1. 1.1A person or thing that is exactly like another.
      ‘there was a bruise on his cheek, a twin to the one on mine’
      • ‘He looked around and saw his twin, who was the mirror image of him, and broke down.’
      • ‘He could have just been a twin to the smaller man.’
      • ‘Like the article says, it's just a mirror-image twin of Prilosec, and therefore can't be expected to behave that much differently.’
      • ‘Indeed, the fugue's subject is almost a twin to the opening theme of Flos campi.’
      • ‘Soulmates are believed to be our ‘love match’, the other twin of our soul.’
      • ‘She wore a mouse-brown tunic belted with a matching braided rope (it matched her twin mouse-brown braids).’
      • ‘While this new belt is the closest known match to our own, it is not a perfect twin.’
      • ‘Her shrieking, wailing voice was the whisper of mortality piercing the ears like the banshee's own call, a twin to the driving terror that pierced the mind.’
      • ‘León and Granada might be at opposing political extremes, but they are matching twins in their architecture.’
      • ‘The recently launched Mercedes S-class could be a twin to BMW's 7-series.’
      • ‘Save for its bright red valve covers, the new engine is a twin to the LS1.’
      • ‘You are seeing more and more of that in business, which is kind of a twin to a profit-sharing plan.’
      exact likeness, mirror image, double, duplicate, carbon copy, replica, lookalike, clone
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    2. 1.2The zodiacal sign or constellation Gemini.
  • 2Something containing or consisting of two matching or corresponding parts, in particular.

    1. 2.1A twin-bedded room.
      • ‘My room, a twin, is plainly furnished but very nice.’
      • ‘There are three large and fully furnished bedrooms - a twin, a double and a single room, so there is lots of space for a family in Ireland on holiday.’
      • ‘The rate is based on two people sharing a twin or double room.’
      • ‘You have to pay for this level of quality, and a standard twin or double room will set you back £260 per night, although smaller doubles are available for £220.’
      • ‘This price is based on two people sharing a twin / double bedded room on a bed and breakfast basis and dates offered start in May and go through to October.’
      • ‘With the exception of suites, all two-bedded rooms are twins.’
      • ‘The boys will be staying in the Emerald Tower wing of the MGM Grand Hotel (sharing a twin and triple room).’
      • ‘Mostly there are four beds to a room, with some twins.’
      • ‘Staying at the 96-room hotel costs from 110 for a standard twin or double room.’
      • ‘A deposit of €220 is required for bookings and there is an option to upgrade to a superior twin or double room for the extra charge of €175.’
      • ‘To stay there over the Christmas break, and potentially qualify for the free holiday, book a twin or double room for two nights.’
      • ‘A two-night break in April for two people sharing a standard twin or double room will set you back £420.’
      • ‘A standard twin or double room with breakfast will set you back around £150 per night, while executive suites are £220.’
    2. 2.2A twin-engined aircraft.
      • ‘For the pilot who can afford to own and operate the six-seater, it remains the paradigm of luxury, speed and handling for light twins.’
      • ‘Introduced in 1964 as a fixed-gear twin, the original version left many folks scratching their heads.’
      • ‘By this month, the company will take possession of its first big twin, a Bell 430.’
      • ‘It may come as a surprise, but not all twins are high-performance airplanes.’
      • ‘As the world's first dedicated multi trainer, the Apache helped teach America's future airline pilots to fly twins.’
      • ‘He told us a Beech twin recently had reported VFR over Wendover, Utah, 120 miles to the west.’
      • ‘I'm not sure how you force a cabin-class twin to that descent rate, at least with the wings still attached.’
      • ‘Before this he had built up lots of time in piston and turbine twins as well as owning a Pitts S2A and S2B which he thoroughly enjoyed.’
      • ‘When it comes to safely flying twins, currency is what keeps you safe.’
      • ‘Why It's Undervalued: If you need a tough, durable, comfortable twin for high and hot, there's not much else you can buy for the same money.’
      • ‘Just like they had done during the airfield rescue, the twins were attacking the saucers.’
      • ‘Some buyers will be moving up from piston singles and twins, raising the question of pilot qualification.’
      • ‘Their target buyer was someone who would be moving up from either a high-end piston single or twin.’
      • ‘After 17 years of flying twins, I was not too excited about the prospect of going back to a single.’
      • ‘The original widebody twin has sold well since its first delivery in 1995.’
      • ‘Not only does he fly IFR, but he also does it in an Aerostar - not exactly your entry-level twin.’
      • ‘Adam Aircraft will be using a side stick on its new centerline thrust twin.’
      • ‘Despite the fact that Senecas are twins, they try not to act like it.’
      • ‘Along the way, Aerostars offer their owners the lightest, most responsive handling of any medium twin.’
      • ‘Here are some critical situations that you should be familiar with and practice regularly to become competent flying twins.’
    3. 2.3A twinned crystal.
      • ‘Rhombohedral penetration twins of the ‘Rossie habit’ are occasionally encountered.’
      • ‘The Boltsburn mine is best known for its large, gemmy fluorite crystals, which are typically penetration twins.’
      • ‘Apart from the lovely development of individual crystals, pentagonite also occurs as twins whereas cavansite does not.’
      • ‘The original cordierite crystals were sixling twins that give the pseudomorphs a flower-shaped cross section.’
      • ‘Good brown macle twins up to several carats in weight have been available in recent years from the Udachnaya mine.’
      • ‘It occurs as small, white single crystals or twins densely covering matrix.’
      • ‘Johnson Park crystals are rarely twinned, and those few twins that were observed are twinned according to the familiar Saint Andrews style.’
      • ‘Calcite grains sometimes display regularly spaced twins, but dynamic recrystallization textures have not been found.’
      • ‘Among the twinned crystals, Baveno twins are more common than Manebach.’


  • 1[attributive] Forming, or being one of, a pair born at one birth.

    ‘she gave birth to twin boys’
    ‘her twin sister’
    • ‘Up next, the emotional story of twin sisters who made sure the mental illness that divided their lives did not break their bond.’
    • ‘One of the twin boys was critically ill, suffering from hypothermia and hypoglycaemia - deficiency of glucose in the bloodstream - and was badly malnourished.’
    • ‘Gavin caught up utterly out of breath and he gave a look of complete gratitude to the twin sisters.’
    • ‘When I was the promotions director for Azuli Records, my twin sister, Paula, came to stay with me for a week and I was so snowed under at work that I asked her to come in and sort out my database.’
    • ‘The Bridesmaid was Martina Murphy, twin sister of the Bride.’
    • ‘Witnesses say they saw nothing-just a little boy and his twin sister playing at the sand part of the park while many other children ran around, screaming.’
    • ‘London-born artists and twin sisters, Amrit and Rabindra, have widely exhibited in the United Kingdom and abroad.’
    • ‘The family is now worried about letting their two other cats, Rainbow, 14, and Tiggy's twin sister Smokey go outside their home.’
    • ‘I think my sister got the newborn twin ponies in 1987, and I vaguely remember having the baby sea ponies; I don't remember the llama and dino at all.’
    • ‘Kor and her twin sister, Miriam Mozes Zeiger, along with thousands of other twins, were subjected to experiments under the direction of Nazi Dr. Josef Mengele.’
    • ‘Lisa, my twin sister, Jane, and I had gone to see Helen Reddy.’
    • ‘The Bill and Ben stories were invented by their older sister Hilda, as tales to keep the twin boys amused whilst they had their bath.’
    • ‘Above Dominic's bed hangs the watercolour painting he made as a gift for his twin sister Rebecca and the letters sent to him by relatives and friends.’
    • ‘The dead girl's twin sister and a 13-year-old girl escaped with minor injuries and were taken to Wythenshawe Hospital.’
    • ‘At his funeral, Gary's twin sister, Hannah, said: ‘Gary was the best brother I could ever imagine having.’’
    • ‘Today the couple are proud parents of twin boys.’
    • ‘Helena suffers from Type One Spinal Muscular Atrophy, a muscle wasting genetic disease from which her twin sister Saskia is mercifully free.’
    • ‘Christine McGlin's twin boys, Christopher and Ross, are 14, strapping lads, but she still picks them up from school.’
    • ‘She was one of a family of seven, six girls and one boy, and was a twin sister of Delia.’
    • ‘Ailsa looked down at her older twin sisters and the boy who was with them.’
    1. 1.1Forming a matching, complementary, or closely connected pair.
      ‘the twin problems of economic failure and social disintegration’
      • ‘In many quarters, the combination of these two dominant features raises twin concerns about political stability and racial and economic justice.’
      • ‘Economic and social development as twin goals of the developmental state cannot take place under the pathologies of greed, tribalism and incompetence.’
      • ‘It's easy, especially given the twin whammies of war and a tough economy, to surrender to despair about your prospects for improvement.’
      • ‘Any mismatch between these two sectors would weaken the functioning of the economy, and would prevent the realisation of the twin objectives of growth and stability.’
      • ‘The second half of the 1920s was a time of remarkable economic achievement, as America reaped the twin dividends of post-war recovery and technological development.’
      • ‘Governed by the twin objectives of lower tax and deregulation, Ireland's economic soul is more like that of the US than the EU.’
      • ‘The twin engines of economic growth - the technological revolution and globalisation - will only widen the existing gap.’
      • ‘Silver (and, later, tin) mining and agriculture in the highlands have historically been the twin pillars of the economy.’
      • ‘As it was, its thick grey walls and twin turrets gave it a look of defensibility, as though it were here despite the quiescent malice of the forest.’
      • ‘He hated waste and ostentatious consumption, and the car he developed at Ford, the Falcon, reflected his twin commitments to economy and safety.’
      • ‘On the ground, heavily armed monster trucks, twin turreted tanks and other impressive enemies will test your mettle.’
      • ‘Maximizing economic growth and minimizing subsistence labor should be the twin goals of any rich, modern society.’
      • ‘It is hard, therefore, for the Executive to reconcile its twin goals of putting the social and economic agendas together at the top of their list of priorities.’
      • ‘The two men will campaign jointly for the next three days on the twin issues of education and the economy, launching the party manifesto chapters dealing with both tomorrow.’
      • ‘Since independence, the twin forces of economic development and population growth have literally bulldozed their way through the city's greenery.’
      • ‘As I have mentioned, the Act had the twin objectives, in summary, of economic advancement and environmental protection.’
      • ‘Who in the world would we rather have as allies and fellow travellers in pursuing the twin challenges of economic performance and social justice?’
      • ‘I follow the Microsoft case with interest, of course, given my twin interests in economics and technology.’
      • ‘This coincides with the current division in the law as represented by the twin doctrines of undue influence and economic duress.’
      • ‘Elliott's mathematical life circulated round the twin foci of Oxford and London.’
      matching, identical, matched, paired
      closely related, closely linked, closely connected
      twofold, double, dual
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    2. 1.2Botany Growing in pairs.
      ‘twin seed leaves’
    3. 1.3(of a bedroom) containing two single beds.
      • ‘Deirdre and Margaret will arrive here on Friday at 3pm and be shown to their tastefully decorated twin bedroom with en suite bathroom.’
      • ‘The other three carriages have been converted to provide two four-poster, three double and two twin bedrooms, allowing guests to combine food with an overnight stay.’
      • ‘She will have a twin room for single use as well as breakfast and her evening meal.’
      • ‘Our attic suite was half the size of our Dublin terrace house, with a huge main bedroom and a comfortable twin room for the boys.’
      • ‘A family suite of two twin rooms (sharing a bathroom) is only £40 a head: an absolute bargain.’
      • ‘There is a choice of single or twin rooms, and every bedroom is en-suite.’
      • ‘The upper floor on both sides consists of a twin bedroom with fitted wardrobes and wooden ceiling beams.’
      • ‘Again, their bedroom will be a twin room with an interconnecting room for the boys.’
      • ‘Accommodation in these units includes two double bedrooms, one twin room and a box bedroom.’
      • ‘Five twin rooms at a Hilton hotel in the UK and Ireland will be awarded to each Driver of the Day at the following race meeting.’
      • ‘The twin bedroom is particularly charming and is now a children's room with nursery rhyme wallpaper and decorative features.’
      • ‘Each chalet has five twin bedrooms, all en suite, a Jacuzzi for tired muscles and log fires.’
      • ‘Each one is a comfortable, self-contained holiday flat with sitting room, dining/kitchen, double or twin rooms and en-suite bathrooms.’
      • ‘A smaller staircase leads to two twin bedrooms, also with en suites.’
      • ‘First there is a twin bedroom with a fitted wardrobe and another unusual feature - the old cottage wall is the inner wall of the room.’
      • ‘The attic is converted to offer two more bedrooms, both twin rooms with solid timber floors.’
      • ‘Weekend retreats and courses cost £80 including accommodation and meals for a single room, and £72 each for a twin room.’
      • ‘Its four floors comprise a kitchen/dining room, a lounge and two twin bedrooms with a ‘turret toilet’ and shower room on each level.’
      • ‘Sleeping arrangements consist of a twin bedroom with a pullout double bed and a single sofa-bed in the living room.’
      • ‘Another double bedroom overlooking the rear garden has dark green walls and an en suite, while there are two further twin bedrooms.’
    4. 1.4(of a crystal) twinned.
      • ‘Continuing on your tour you see a 70-cm-high giant twin calcite crystal from Siberia that gives off an amber glow in sunlight.’


  • Link; combine.

    ‘the company twinned its core business of brewing with that of distilling’
    • ‘In habitually using the term ‘nation-state’ to describe our collective status, we assume these two entities to be indissolubly twinned.’
    • ‘His best-selling dish twins pepper shrimp with a rum and ginger sauce.’
    • ‘The two groups were twinned back in 1998 as part of a Co-Operation Ireland initiative.’
    • ‘It seems impossible to believe any highway development project could move more slowly than that to twin the highway south of Winnipeg.’
    • ‘A major project will be taking place to twin the road between Exits 3 and 5.’
    • ‘Six- and four-bed wards are twinned, with one nursing station covering the pair.’
    • ‘I twin this with a memory, from the same period, of stalking out of one of my writing classes because the students hadn't done the reading.’
    • ‘You can't twin democracy and occupation, you can't twin freedom and occupation.’
    combine, join, link, couple, pair, yoke, match
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Late Old English twinn double from twi- two; related to Old Norse tvinnr. Current verb senses date from late Middle English.