—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. Naut.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. 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. 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. Radio and Television.a written account of everything transmitted by a station or network.
10. Also called log of wood.Australian Slang.a lazy, dull-witted person; fool.
—v.t. 1. to cut (trees) into logs: to log pine trees for fuel. 2. to cut down the trees or timber on (land): We logged the entire area in a week. 3. to enter in a log; compile; amass; keep a record of: to log a day's events. 4. to make (a certain speed), as a ship or airplane: We are logging 18 knots. 5. 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. 1. to cut down trees and get out logs from the forest for timber: to log for a living. 2. 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.
3. log off or out,Computers.to terminate a work session using a multiuser system, or a connection to such a system.