There are 2 definitions of log in English:

log1

Line breaks: log
Pronunciation: /lɒg
 
/

noun

1A part of the trunk or a large branch of a tree that has fallen or been cut off: she tripped over a fallen log [as modifier]: a roaring log fire
More example sentences
  • 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.
  • She went into the forest, slowing only enough to avoid trees and fallen logs.
  • This group has a great diversity of roosting habits, including caves, hollow logs, tree branches, tunnels, and human houses.
Synonyms
chunk of wood, branch, tree trunk, bole, stump; block of wood, billet; timber
2 (also logbook) An official record of events during the voyage of a ship or aircraft: a ship’s log
More example sentences
  • Solomon and Hart used Hudson Bay Company postal records and ships' logbooks to examine storm frequency and severity in the Beaufort Sea.
  • The FAA acquired the aircraft logbooks, and months of investigation began.
  • Most of the aircraft have no logbooks, have run-out engines and props, and need a lot of work.
2.1A regular or systematic record of incidents or observations: keep a detailed log of your activities
More example sentences
  • Residents will also be able to record incidences on logs, which will be distributed by the police.
  • Self-testing devices and devices that maintain logs to track incidents are available.
  • At the same time, White House attorneys are reviewing memos, phone logs and other documents that may be relevant to the investigation.
3An apparatus for determining the speed of a ship, originally one consisting of a float attached to a knotted line that is wound on a reel, the distance run out in a certain time being used as an estimate of the vessel’s speed.
More example sentences
  • 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.
  • 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.

verb (logs, logging, logged)

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1Enter (an incident or fact) in the log of a ship or aircraft or in another systematic record: the incident has to be logged
More example sentences
  • ‘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.
  • This detail is logged into the system, and so is the fact that an engineer is required to visit the client.
  • Two police forces, the national rail operating system and the local train service have all logged the incident.
Synonyms
register, record, make a note of, note down, write down, jot down, book down, set down, put down, put in writing; enter, file, minute, chart, tabulate, catalogue
1.1(Of a ship, aircraft, or pilot) achieve (a certain distance, speed, or time): she had logged more than 12,000 miles since her launch
More example sentences
  • 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.
Synonyms
attain, achieve, chalk up, make, do, go, cover
1.2Make a systematic recording of events, observations, or measurements: the virus can log keystrokes that you make when you log on to all sorts of services
More example sentences
  • Even more worrying is the way enquiries are logged.
  • Bugbear, another blended threat, spread through network shares but also logged keystrokes and functioned as a back door.
  • 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: there are plans to log 250,000 hectares of virgin rainforest
More example sentences
  • 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.
  • 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.

Origin

Middle English (in the sense 'bulky mass of wood'): of unknown origin; perhaps symbolic of the notion of heaviness. 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.

Phrases

(as) easy as falling off a log

informal Very easy.
More example sentences
  • 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.
More example sentences
  • This ID is what lets Napster know a banned computer is trying to log on.
  • It was a UNIX system, and I logged on as root every day without their knowledge.
  • I sat by a computer and logged on with the username and password I had been given with my timetable.

log off (or out)

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

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There are 2 definitions of log in English:

log2

Line breaks: log
Pronunciation: /lɒg
 
/

noun

short for logarithm. [as modifier]: log tables [prefixed to a number or algebraic symbol]: log x

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Definition of log in: