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.

    • ‘The suspect later attended a gathering during which he placed some other logs in a fireplace.’
    • ‘She strode over to a couple of fallen logs and kicked one of them.’
    • ‘Fermenting layers are thickest on high spots, surrounding stumps and along large fallen logs.’
    • ‘The process is a form of combustion, similar to burning a log in a fireplace.’
    • ‘It spends most of the day under stones, but can also be found under logs or tree trunks, though this is less common.’
    • ‘One is a petrified log of wood 200 million years old.’
    • ‘The girl threw a log on the fire, and poked the embers into flames.’
    • ‘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.’
    • ‘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.’
    • ‘They dodged around trees, leaping over fallen logs.’
    • ‘It built its nests in cavities among tree roots or in fallen logs or clumps of ferns.’
    • ‘Typically, a family might use 15 logs of wood a day in order to prepare their meals.’
    • ‘This group has a great diversity of roosting habits, including caves, hollow logs, tree branches, tunnels, and human houses.’
    • ‘He was sitting on a fallen log by the fire.’
    • ‘Forgive me a moment and I'll throw a log on the fire.’
    • ‘We like to keep it to the native things around here, like trees and rocks and fallen logs.’
    • ‘She went into the forest, slowing only enough to avoid trees and fallen logs.’
    • ‘You lift a rotting log with one hand and pry out juicy grubs with your other forefinger.’
    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’
    • ‘Using your logbook, you can then approximate fuel flow using average speeds and time underway.’
    • ‘Fuel burn calculations were based on flight times listed in the airplane logbook.’
    • ‘We do not know the particulars of 06624's participation due to the lack of pilot logbooks and other sources identifying specific aircraft.’
    • ‘That would be bad enough, but, unfortunately, the stolen property was an aircraft logbook, which had been taken out of a plane.’
    • ‘Most of the aircraft have no logbooks, have run-out engines and props, and need a lot of work.’
    • ‘The instructor who flew with her said that he would not endorse her flight logbook for complex aircraft.’
    • ‘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.’
    • ‘I logged all the 6000 hours in my logbook in my own airplanes.’
    • ‘Phelps, who first went to sea as a cabin boy in 1816, worked from original journals and logbooks now mostly lost.’
    • ‘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.’
    • ‘Solomon and Hart used Hudson Bay Company postal records and ships' logbooks to examine storm frequency and severity in the Beaufort Sea.’
    • ‘The best place to start your search is in your own logbook.’
    • ‘He accessed the ship's computer archives, logging into to the ship's logs.’
    • ‘The FAA acquired the aircraft logbooks, and months of investigation began.’
    • ‘I have enclosed an excerpt from the ship's log from before the crash.’
    • ‘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.’
    • ‘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.’
    • ‘No mention of the oil filter change was found in the logbook.’
    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 claimed she later handed him a copy of the police log of the incident.’
      • ‘Do you check your referrer logs and surf the blogosphere all day from your office?’
      • ‘Self-testing devices and devices that maintain logs to track incidents are available.’
      • ‘Keeping a training log is a good way to stay motivated.’
      • ‘She said she had never knowingly touched the incident log.’
      • ‘This included a drugs raid in May, fights in the pub and a log of incidents over the past year.’
      • ‘Residents will also be able to record incidences on logs, which will be distributed by the police.’
      • ‘At the same time, White House attorneys are reviewing memos, phone logs and other documents that may be relevant to the investigation.’
      • ‘She suggests regularly sharing a detailed log of current work projects and accomplishments with your boss.’
      • ‘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.’
      • ‘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.’
      • ‘She was too busy to read the daily log each day.’
      • ‘Keep a daily log of five things you're grateful for.’
      • ‘I was scanning the referral logs tonight and noticed a new blog.’
      • ‘Part of the answer is to check your web server logs.’
      • ‘The attacker then simply needs to check his web server logs to know the victim's session cookie.’
      • ‘Write it down on your calendar and keep a daily exercise log.’
      • ‘Now I discover, through referrer logs, that somebody is visiting from Iceland.’
      • ‘I would like to see the referrer logs and the follow-on links for sites.’
      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’
    • ‘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.’
    • ‘When she complained to the council she was asked to log the incidents.’
    • ‘The control tower logged the incident as an ‘unidentified flying object’.’
    • ‘I would call the police and make sure each incident is logged.’
    • ‘They would be logging any incidents, to form a case for the closure of the home.’
    • ‘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.’
    • ‘Two police forces, the national rail operating system and the local train service have all logged the incident.’
    • ‘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.’
    • ‘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.’
    • ‘They phoned the police who logged the incident, but didn't hold much hope in getting her back.’
    • ‘We only log the details of those incidents where there have been injuries.’
    • ‘This detail is logged into the system, and so is the fact that an engineer is required to visit the client.’
    • ‘It also logs incidents by location, not perpetrator.’
    • ‘Last year, more than 300 serious incidents were logged - but one operator said that was only the tip of the iceberg.’
    • ‘Early reporting means that police can log the incidents and have more leads to follow.’
    • ‘There's a database which logs all the calls and incidents, and which gives us an overview.’
    • ‘‘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.’
    • ‘A state-of-the-art system is used to log details of burglaries.’
    • ‘Then they log what they did, what they ate and how they felt.’
    • ‘He logs his experiences and thoughts on computer by event and refers back to them in an attempt to avoid repeating mistakes.’
    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’
      • ‘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.’
      • ‘By the end of the month, the aircraft had logged about 26 hours of flying time during an equal number of test flights.’
      • ‘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.’
      • ‘Bugbear, another blended threat, spread through network shares but also logged keystrokes and functioned as a back door.’
      • ‘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.’
  • 2Cut down (an area of forest) in order to exploit the timber commercially.

    • ‘More than 95 percent of America's old-growth forests has been logged.’
    • ‘Seventy-five percent of the island's ancient forests have been logged.’
    • ‘Timber companies had their eyes on logging the streamside forests.’
    • ‘If I could secure a permit for him to log a different area, he would leave Betumonga alone.’
    • ‘Thailand's forests were logged without mercy following World War II, losing nearly 75 percent of their virgin stands.’
    • ‘In some places, great swathes of hillside have been cut away in the urgency to log timber.’
    • ‘Companies do not have to bid competitively to log public forests.’
    • ‘To supply wood for the kilns native red beech in the area was logged.’
    • ‘According to Bapedal, the Indonesian government's environment agency, 57 timber companies are logging a massive 11 million hectare area in the region.’
    • ‘By 1890, 80 percent of all native forest had been logged.’
    • ‘For one thing, a cleanup plan should require regrowing heavily logged forests above the Silver Valley, says Osborn.’
    • ‘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.’
    • ‘Yet currently they receive few financial benefits from the trees that are logged on this land.’
    • ‘Sand mining was permitted at Fraser until 1976, and its forests were logged until late 1991.’
    • ‘Most of these older forests have been selectively logged but never cleared for cultivation.’
    • ‘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.’
    • ‘Approximately 200 meters on either side of the ‘priority one’ area were selectively logged.’
    • ‘Mackay says a lot of the burned timber won't be logged.’
    • ‘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.’
    • ‘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.’


  • (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.

      • ‘Furiously, Cassie logs out of her computer, disturbed by the somewhat cryptic message.’
      • ‘Since you are already identifying users when they log in, returning preferred style sheets would be a snap.’
      • ‘In Figure 2, one can see from the IP addresses that the root user was logged in from different clients.’
      • ‘At the end of the day Josh shut down his computer and logged out.’
      • ‘Make sure you are logging on to a legitimate website by typing in the URL rather than using a link.’
      • ‘Mulder logged out of his computer and headed for the door.’
      • ‘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.’
      • ‘They can set up and store personal settings on the system which are activated every time they log on.’
      • ‘This ID is what lets Napster know a banned computer is trying to log on.’
      • ‘Erin returns home and quickly goes to her computer and logs on using Nic's screenname.’
      • ‘When a user logs in, he or she is initially at Home Page view.’
      • ‘Attempting to log on to the online service results in a blank page.’
      • ‘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.’
      • ‘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.’
      • ‘He turned his computer on, logged on to a search engine, and searched under ‘sniper’.’
      • ‘This program will continue downloading even after you log out.’
      • ‘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.’
      • ‘I sat by a computer and logged on with the username and password I had been given with my timetable.’
      • ‘You need a computer to log on to the Internet, but Internet cafés are not hard to find in Japan.’
      • ‘Users log in with their e-mail addresses and a password to access the bug database.’
      • ‘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.’
      • ‘Sputnik requires users to log in before using the system, so a wireless network provider knows who's tapping its resources.’
      • ‘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.’
      • ‘It was a UNIX system, and I logged on as root every day without their knowledge.’
      • ‘On our return to the apartment I opened my laptop and logged on to my e-mail.’
      • ‘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.’
      • ‘I logged out of my computer as Brandon's communicator rung.’
      • ‘In order to get access, a user should log in into the system.’
      • ‘The workstations ran Windows XP Pro, and all students logged in using a single user name and password local to the workstation.’
      • ‘Every user needs to log in with a legitimate username/password combination to post references and comments.’
  • log off (or out)

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

      • ‘If that user logs off the workstation, the TP User becomes the user who has been logged onto the system the longest.’
      • ‘Remember that your computer will still log off automatically if you do not use use it for more than 30 minutes.’
      • ‘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’