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. any of various devices for determining the speed of a ship, as a chip log or patent log.
4.
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.
Movies. an account describing or denoting each shot as it is taken, written down during production and referred to in editing the film.
6.
a register of the operation of a machine.
7.
Also called well log.a record kept during the drilling of a well, esp. of the geological formations penetrated.
8.
Computers. any of various chronological records made concerning the use of a computer system, the changes made to data, etc.
9.
Radioand Television. a written account of everything transmitted by a station or network.
10.
Also called log of wood.AustralianSlang. a lazy, dull-witted person; fool.
–verb (used with object)
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.
to make (a certain speed), as a ship or airplane: We are logging 18 knots.
15.
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.
–verb (used without object)
16.
to cut down trees and get out logs from the forest for timber: to log for a living.
—Verb phrases
17.
log in,
a.
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.
b.
to enter or include any item of information or data in a record, account, etc.
18.
log off or out, Computers. to terminate a work session using a multiuser system, or a connection to such a system.
Origin: 1350–1400; ME logge, var. of lugge pole, limb of tree; cf. obs. logget pole; see lugsail, logbook
[lawg, log] 
noun, verb, logged, log⋅ging.