log

UK: /ˈlɒg/ US: /lɔg, lɑg/ ,(lôg, log)

Inflections of 'log' (v): (⇒ conjugate)

logs

v 3rd person singular

logging

v pres p

logged

v past

logged

v past p

WordReference Random House Learner's Dictionary of American English © 2025

log¹ /lɔg, lɑg/   n., v., logged, log•ging. 
n. [countable]

1. a portion or length of the trunk or of a large limb of a tree that has fallen.
2. any detailed, usually sequential record, as of the progress of an activity or of the trip of a ship or aircraft.

v. 

3. [~ + object] to cut (trees) into logs.
4. to cut down the trees or timber on (land): [~ + object]
   logging the mountain behind our house.
   [no object]
   They have logged in that area for generations.
5. to enter in a log;
   compile:
   [~ + object] The captain logged the ship's position.
6. Aeronautics to travel at or for (a certain speed, time, or distance):
   [~ + object] logged 10,000 hours flying time.
7. log in or on, [no object] to gain access to a secured computer system or on-line service by keying in personal identification information.
8. Computing log off or out, to terminate a session on such a system or service: [no object]
   He logs off at night.
   [~ + object]
   He logged off the system.

log•ger, n. [countable]

log² /lɔg, lɑg/   n. 

1. Mathematics logarithm.

-log-, root. 

1. -log- comes from Greek, where it has the meaning "speak;
   word;
   speech.'' This meaning is found in such words as: analog, apology, chronology, decalogue, dialogue, doxology, epilogue, eulogy, ideology, logarithm, logic, logo, monologue, neologism, philology, syllogism, tautology, terminology.

See -logy.

WordReference Random House Unabridged Dictionary of American English © 2025

log¹  (lôg, log), n., v., logged, log•ging. 
n. 

1. a portion or length of the trunk or of a large limb of a felled tree.
2. something inert, heavy, or not sentient.
3. Nautical, Naval Terms any of various devices for determining the speed of a ship, as a chip log or patent log.
4. Aeronautics, Nautical, Naval Terms any of various records, made in rough or finished form, concerning a trip made by a ship or aircraft and dealing with particulars of navigation, weather, engine performance, discipline, and other pertinent details;
   logbook.
5. [Motion Pictures.] an account describing or denoting each shot as it is taken, written down during production and referred to in editing the film.
6. Mechanical Engineering a register of the operation of a machine.
7. Geology, Mining Also called well log. a record kept during the drilling of a well, esp. of the geological formations penetrated.
8. Computing any of various chronological records made concerning the use of a computer system, the changes made to data, etc.
9. Show Business [Radio and Television.] a written account of everything transmitted by a station or network.
10. British Terms Also called log of wood. [Australian Slang.] a lazy, dull-witted person;
    fool.

v.t. 

11. to cut (trees) into logs:
    to log pine trees for fuel.
12. to cut down the trees or timber on (land):
    We logged the entire area in a week.
13. to enter in a log;
    compile;
    amass;
    keep a record of:
    to log a day's events.
14. Aeronautics to make (a certain speed), as a ship or airplane:
    We are logging 18 knots.
15. Transport to travel for (a certain distance or a certain amount of time), according to the record of a log:
    We logged 30 miles the first day. He has logged 10,000 hours flying time.

v.i. 

16. to cut down trees and get out logs from the forest for timber:
    to log for a living.
17. Computing log in:
    • Also, log on, sign on. [Computers.] to enter identifying data, as a name or password, into a multiuser system, so as to be able to do work with the system.
    • to enter or include any item of information or data in a record, account, etc.
18. Computing log off or out, to terminate a work session using a multiuser system, or a connection to such a system.

• 1350–1400; Middle English logge, variant of lugge pole, limb of tree; compare obsolete logget pole; see lugsail, logbook

log′gish, adj. 

log²  (lôg, log), n. 

1. Mathematics logarithm.

log-, 

1. var. of logo- before a vowel:
   logarithm.

-log, 

1. var. of -logue:
   analog.

log., 

1. logic.

Collins Concise English Dictionary © HarperCollins Publishers::

log / lɒɡ/ noun

1. a section of the trunk or a main branch of a tree, when stripped of branches
2. (modifier) constructed out of logs: a log cabin
3. a detailed record of a voyage of a ship or aircraft
4. a record of the hours flown by pilots and aircrews
5. a book in which these records are made; logbook
6. a written record of information about transmissions kept by radio stations, amateur radio operators, etc
7. a device consisting of a float with an attached line, formerly used to measure the speed of a ship
8. heave the log ⇒ to determine a ship's speed with such a device
9. a claim for better pay and conditions presented by a trade union to an employer
10. like a log ⇒ without stirring or being disturbed (in the phrase sleep like a log)

verb (logs, logging, logged)

1. (transitive) to fell the trees of (a forest, area, etc) for timber
2. (transitive) to saw logs from (trees)
3. (intransitive) to work at the felling of timber
4. (transitive) to enter (a distance, event, etc) in a logbook or log
5. (transitive) to record the punishment received by (a sailor) in a logbook
6. (transitive) to travel (a specified distance or time) or move at (a specified speed)

Etymology: 14th Century: origin obscure

log / lɒɡ/ noun

1. short for logarithm

WordReference Random House Learner's Dictionary of American English © 2025

-logue or -log,

1. See -log-.

WordReference Random House Learner's Dictionary of American English © 2025

lo•go /ˈloʊgoʊ/   n. [countable] , pl. -gos. 

Also called lo•go•type. /ˈloʊgoʊˌtaɪp/.  
1. a graphic representation or a symbol of a company name, trademark, etc., esp. one designed to be recognized easily.

See -log-.

WordReference Random House Unabridged Dictionary of American English © 2025

-logue, 

1. a combining form used in the names of kinds of discourse, spoken or written:
   analogue;
   monologue;
   travelogue.

Also, -log. 

• Greek -logos. See logos
• Latin -logus
• French

WordReference Random House Unabridged Dictionary of American English © 2025

lo•go  (lō′gō), n., pl. -gos. 

1. Also called logotype. a graphic representation or symbol of a company name, trademark, abbreviation, etc., often uniquely designed for ready recognition.
2. Printing logotype (def. 1).

• by shortening of logotype or logogram

LOGO  (lō′gō), n. [Computers.]

1. Computing a high-level programming language widely used to teach children how to use computers.

• Greek lógos word (see logos), spelling, spelled as if an acronym

logo-, 

1. a combining form appearing in loanwords from Greek, where it meant "word,'' "speech'' (logography);
   on this model, used in the formation of new compound words (logotype).

Also,[esp. before a vowel,] log-. Cf. -logic, -logue, -logy. 

• Greek logo-, combining form of lógos logos

Collins Concise English Dictionary © HarperCollins Publishers::

-log combining_form

1. a US variant of -logue