Main definitions of log in US English:

: log1log2



  • 1A part of the trunk or a large branch of a tree that has fallen or been cut off.

    • ‘One is a petrified log of wood 200 million years old.’
    • ‘The suspect later attended a gathering during which he placed some other logs in a fireplace.’
    • ‘This group has a great diversity of roosting habits, including caves, hollow logs, tree branches, tunnels, and human houses.’
    • ‘You lift a rotting log with one hand and pry out juicy grubs with your other forefinger.’
    • ‘Soldiers use micro-terrain, perhaps a fold on the ground only two or three inches high as well as the more visible tree trunks, logs, and bushes.’
    • ‘A mountain biker was injured and had to be rescued on Thursday on a swampy part of a trail on Mount Seymour where bikers ride over fallen logs.’
    • ‘Even though she knew that there would be no berries, for it was early fall, she walked deep into the woods and past fallen logs and trees to the same meadow that her mother had told her about.’
    • ‘It built its nests in cavities among tree roots or in fallen logs or clumps of ferns.’
    • ‘Fermenting layers are thickest on high spots, surrounding stumps and along large fallen logs.’
    • ‘Forgive me a moment and I'll throw a log on the fire.’
    • ‘He was sitting on a fallen log by the fire.’
    • ‘She went into the forest, slowing only enough to avoid trees and fallen logs.’
    • ‘We like to keep it to the native things around here, like trees and rocks and fallen logs.’
    • ‘The process is a form of combustion, similar to burning a log in a fireplace.’
    • ‘They dodged around trees, leaping over fallen logs.’
    • ‘It spends most of the day under stones, but can also be found under logs or tree trunks, though this is less common.’
    • ‘Typically, a family might use 15 logs of wood a day in order to prepare their meals.’
    • ‘The girl threw a log on the fire, and poked the embers into flames.’
    • ‘She strode over to a couple of fallen logs and kicked one of them.’
    • ‘He scurried around a clearing we'd made with our machetes and arranged a half-dozen fallen logs, each about eight feet long, into a giant spoked pattern.’
    chunk of wood, branch, tree trunk, bole, stump
    View synonyms
  • 2An official record of events during the voyage of a ship or aircraft.

    ‘a ship's log’
    • ‘That would be bad enough, but, unfortunately, the stolen property was an aircraft logbook, which had been taken out of a plane.’
    • ‘The best place to start your search is in your own logbook.’
    • ‘No mention of the oil filter change was found in the logbook.’
    • ‘I logged all the 6000 hours in my logbook in my own airplanes.’
    • ‘Most of the aircraft have no logbooks, have run-out engines and props, and need a lot of work.’
    • ‘He accessed the ship's computer archives, logging into to the ship's logs.’
    • ‘If this is the first annual inspection that your IA has performed on your plane, be sure you allow ample time for review of your plane's airframe, engine and propeller logbooks.’
    • ‘The instructor who flew with her said that he would not endorse her flight logbook for complex aircraft.’
    • ‘Fuel burn calculations were based on flight times listed in the airplane logbook.’
    • ‘Solomon and Hart used Hudson Bay Company postal records and ships' logbooks to examine storm frequency and severity in the Beaufort Sea.’
    • ‘Phelps, who first went to sea as a cabin boy in 1816, worked from original journals and logbooks now mostly lost.’
    • ‘For those with older planes, it will save you time and money if, at the next inspection, you or your IA flag each page of the logbooks at which particular ADs are complied.’
    • ‘We do not know the particulars of 06624's participation due to the lack of pilot logbooks and other sources identifying specific aircraft.’
    • ‘This examination had to be done with a CAA Inspector who had to endorse the aircraft's logbook.’
    • ‘Then, the aircraft can be reassembled and tested, and the inspection can be entered into the plane's logbooks.’
    • ‘Using your logbook, you can then approximate fuel flow using average speeds and time underway.’
    • ‘This story, which is at the core of Ghost Ships, was pieced together by McNab from fragments of correspondence, telegrams and an extensive examination of steamship logbooks of the period.’
    • ‘I have enclosed an excerpt from the ship's log from before the crash.’
    • ‘The FAA acquired the aircraft logbooks, and months of investigation began.’
    record, register, logbook, journal, diary, chronicle, daybook, record book, ledger
    View synonyms
    1. 2.1 A regular or systematic record of incidents or observations.
      ‘keep a detailed log of your activities’
      • ‘He secretly took a copy of the incident log which he later gave to police.’
      • ‘She clashed with the headmistress so often that she kept a log of incidents on the advice of colleagues.’
      • ‘Residents will also be able to record incidences on logs, which will be distributed by the police.’
      • ‘Keep a daily log of five things you're grateful for.’
      • ‘Voters could cast unlimited votes without being detected by mechanisms within the voting terminal, they reported, and votes could be overwritten in the system's logs.’
      • ‘Now I discover, through referrer logs, that somebody is visiting from Iceland.’
      • ‘Self-testing devices and devices that maintain logs to track incidents are available.’
      • ‘Write it down on your calendar and keep a daily exercise log.’
      • ‘Do you check your referrer logs and surf the blogosphere all day from your office?’
      • ‘She was too busy to read the daily log each day.’
      • ‘I was scanning the referral logs tonight and noticed a new blog.’
      • ‘He claimed she later handed him a copy of the police log of the incident.’
      • ‘She said she had never knowingly touched the incident log.’
      • ‘Part of the answer is to check your web server logs.’
      • ‘I would like to see the referrer logs and the follow-on links for sites.’
      • ‘She suggests regularly sharing a detailed log of current work projects and accomplishments with your boss.’
      • ‘At the same time, White House attorneys are reviewing memos, phone logs and other documents that may be relevant to the investigation.’
      • ‘The attacker then simply needs to check his web server logs to know the victim's session cookie.’
      • ‘This included a drugs raid in May, fights in the pub and a log of incidents over the past year.’
      • ‘Keeping a training log is a good way to stay motivated.’
      record, register, logbook, journal, diary, chronicle, daybook, record book, ledger
      View synonyms
  • 3An apparatus for determining the speed of a ship, originally consisting of a float attached to a knotted line wound on a reel, the distance run out in a certain time being used as an estimate of the vessel's speed.

    • ‘One method of keeping direction, the log and the line, is generally discounted when a ship is sailing by compass correctly; this is true of the Pequod.’
    • ‘Traditionally, a vessel's speed was determined using a log and line - a float on the end of a line knotted at precise intervals and tossed overboard.’
  • 4the log" or "the log of woodNZ informal The Ranfurly Shield, an interprovincial rugby union trophy competed for annually in New Zealand.

    ‘errors late in the game cost them a shot at the log of wood’


[with object]
  • 1Enter (an incident or fact) in the log of a ship or aircraft or in another systematic record.

    ‘the incident has to be logged’
    ‘the red book where we log our calls’
    • ‘A state-of-the-art system is used to log details of burglaries.’
    • ‘He logs his experiences and thoughts on computer by event and refers back to them in an attempt to avoid repeating mistakes.’
    • ‘The bailiffs who arrived with two lorries started to log details of town hall equipment, including computers and vehicles, and said they would remove them if the payment was not made.’
    • ‘I would call the police and make sure each incident is logged.’
    • ‘They phoned the police who logged the incident, but didn't hold much hope in getting her back.’
    • ‘Then they log what they did, what they ate and how they felt.’
    • ‘Users can poll the system to see if that fact was logged, and find out who contributed that fact, and when they did, without knowing their real name.’
    • ‘Last year, more than 300 serious incidents were logged - but one operator said that was only the tip of the iceberg.’
    • ‘‘We are still at the same stage,’ said a Garda spokesperson who could not give any indication as to when the system would begin to log racist incidents.’
    • ‘Two police forces, the national rail operating system and the local train service have all logged the incident.’
    • ‘When everything is discussed on a message board online, you don't need to log details of conversations or take minutes of meetings - all the information is right in front of you.’
    • ‘The control tower logged the incident as an ‘unidentified flying object’.’
    • ‘They would be logging any incidents, to form a case for the closure of the home.’
    • ‘This detail is logged into the system, and so is the fact that an engineer is required to visit the client.’
    • ‘When she complained to the council she was asked to log the incidents.’
    • ‘I watch as John starts to log the vehicle's details on his computer, but am slightly puzzled when he leans over and closely inspects its wheels.’
    • ‘It also logs incidents by location, not perpetrator.’
    • ‘Early reporting means that police can log the incidents and have more leads to follow.’
    • ‘We only log the details of those incidents where there have been injuries.’
    • ‘There's a database which logs all the calls and incidents, and which gives us an overview.’
    register, record, make a note of, note down, write down, jot down, book down, set down, put down, put in writing
    View synonyms
    1. 1.1 (of a ship, aircraft, or pilot) achieve (a certain distance, speed, or time)
      ‘she had logged more than 12,000 miles since she had been launched’
      • ‘By the end of the month, the aircraft had logged about 26 hours of flying time during an equal number of test flights.’
      • ‘The leading maxis were logging average speeds of between 13 and 15 knots and were still on course to smash the current crossing record of 14 days and five hours.’
      • ‘Many of these aircraft have logged more than 20,000 hr.’
      • ‘Its Air Force and Navy X - 35 aircraft had already logged 27 and 58 hours of flight time, respectively.’
      attain, achieve, chalk up, make, do, go, cover
      View synonyms
    2. 1.2 Make a systematic recording of events, observations, or measurements.
      ‘the virus can log keystrokes that you make when you access all sorts of services’
      • ‘Eilish had, he said, the courage to put her head above the parapet and undertake the enormous task of logging the memories of the area.’
      • ‘Even more worrying is the way enquiries are logged.’
      • ‘She joined the summer fieldtrips in 2002 and 2003, and has been the lab scribe, logging the group's daily trials and travails.’
      • ‘Bugbear, another blended threat, spread through network shares but also logged keystrokes and functioned as a back door.’
  • 2Cut down (an area of forest) in order to exploit the timber commercially.

    • ‘Yet currently they receive few financial benefits from the trees that are logged on this land.’
    • ‘To supply wood for the kilns native red beech in the area was logged.’
    • ‘Environmentalists countered that the idea of logging the forest to save it was absurd, and that one sawmill was not worth the ecological price of cutting into the ancient forest.’
    • ‘By 1890, 80 percent of all native forest had been logged.’
    • ‘More than 95 percent of America's old-growth forests has been logged.’
    • ‘Approximately 200 meters on either side of the ‘priority one’ area were selectively logged.’
    • ‘According to Bapedal, the Indonesian government's environment agency, 57 timber companies are logging a massive 11 million hectare area in the region.’
    • ‘Timber companies had their eyes on logging the streamside forests.’
    • ‘For one thing, a cleanup plan should require regrowing heavily logged forests above the Silver Valley, says Osborn.’
    • ‘Deny said local residents had been persuaded by the owners of several timber companies to log areas within KEL, including the protected Mount Leuser National Park.’
    • ‘In some places, great swathes of hillside have been cut away in the urgency to log timber.’
    • ‘Mackay says a lot of the burned timber won't be logged.’
    • ‘Once the most valuable trees have been taken down, the kuda-kuda trails are often sold to another group of loggers and the areas are repeatedly logged for less valuable trees.’
    • ‘Most of these older forests have been selectively logged but never cleared for cultivation.’
    • ‘Companies do not have to bid competitively to log public forests.’
    • ‘Thailand's forests were logged without mercy following World War II, losing nearly 75 percent of their virgin stands.’
    • ‘Seventy-five percent of the island's ancient forests have been logged.’
    • ‘If I could secure a permit for him to log a different area, he would leave Betumonga alone.’
    • ‘By 1940, virtually all trees in the state that were valuable as timber had been logged, and much of the land had been turned to pasture.’
    • ‘Sand mining was permitted at Fraser until 1976, and its forests were logged until late 1991.’


  • (as) easy as falling off a log

    • informal Very easy.

      • ‘These guys have had a great run, but they've seen as well that it's not as easy as falling off a log - particularly in distribution.’
      • ‘If they've got a sensible database-driven-automatic-router-building widget (I'm sure there's a good name for that), then it's as easy as falling off a log.’
      • ‘What's needed is a mechanism that makes those options as easy as falling off a log.’

Phrasal Verbs

  • log in (or on)

    • Go through the procedures to begin use of a computer, database, or system.

      • ‘When a user logs in, he or she is initially at Home Page view.’
      • ‘It was a UNIX system, and I logged on as root every day without their knowledge.’
      • ‘Every user needs to log in with a legitimate username/password combination to post references and comments.’
      • ‘These lines list the time at which the login attempt was made, the user who tried to log in as another user, if available, and the target user.’
      • ‘In Figure 2, one can see from the IP addresses that the root user was logged in from different clients.’
      • ‘Since you are already identifying users when they log in, returning preferred style sheets would be a snap.’
      • ‘That witness told the jury of the warnings on the screen of the Police National Computer when an officer logged on to the computer to obtain data.’
      • ‘Users who have not logged in to the system are invited to do so if they already have an account or to join the system as a member if they do not yet have an account.’
      • ‘This program will continue downloading even after you log out.’
      • ‘Mulder logged out of his computer and headed for the door.’
      • ‘Furiously, Cassie logs out of her computer, disturbed by the somewhat cryptic message.’
      • ‘You must follow a strict procedure when you log out of the network and pull out the card, lest you have to reboot to reconnect.’
      • ‘Users log in with their e-mail addresses and a password to access the bug database.’
      • ‘Using call-back, the user calls the computer and logs on, then the computer hangs up and calls back to the number authorized for the user.’
      • ‘You need a computer to log on to the Internet, but Internet cafés are not hard to find in Japan.’
      • ‘I logged out of my computer as Brandon's communicator rung.’
      • ‘In order to get access, a user should log in into the system.’
      • ‘This ID is what lets Napster know a banned computer is trying to log on.’
      • ‘The workstations ran Windows XP Pro, and all students logged in using a single user name and password local to the workstation.’
      • ‘Attempting to log on to the online service results in a blank page.’
      • ‘Sputnik requires users to log in before using the system, so a wireless network provider knows who's tapping its resources.’
      • ‘At the end of the day Josh shut down his computer and logged out.’
      • ‘He turned his computer on, logged on to a search engine, and searched under ‘sniper’.’
      • ‘They can set up and store personal settings on the system which are activated every time they log on.’
      • ‘I sat by a computer and logged on with the username and password I had been given with my timetable.’
      • ‘When a user running Internet Explorer logs on to a contaminated site, the user's PC is infected with malicious code, which has the potential to cause further problems.’
      • ‘On our return to the apartment I opened my laptop and logged on to my e-mail.’
      • ‘Erin returns home and quickly goes to her computer and logs on using Nic's screenname.’
      • ‘Conspiracy theorists at Brunel say academics have logged on to their computers to vote only to find someone else has already done so for them.’
      • ‘Make sure you are logging on to a legitimate website by typing in the URL rather than using a link.’
  • log off (or out)

    • Go through the procedures to conclude use of a computer, database, or system.

      • ‘Remember that your computer will still log off automatically if you do not use use it for more than 30 minutes.’
      • ‘If that user logs off the workstation, the TP User becomes the user who has been logged onto the system the longest.’
      • ‘She logs off and logs back on and she gets a message that her account is locked out.’


Middle English (in the sense ‘bulky mass of wood’): of unknown origin; perhaps symbolic of the notion of heaviness. log (sense 3 of the noun) originally denoted a thin quadrant of wood loaded to float upright in the water, whence ‘ship's journal’ in which information derived from this device was recorded.


Main definitions of log in US English:

: log1log2



  • as modifier ‘log tables’
    short for logarithm
    prefixed to a number or algebraic symbol ‘log x’