log

A logarithm.

A usually large section of a trunk or limb of a fallen or felled tree.

A long thick section of trimmed, unhewn timber.

A device trailed from a ship to determine its speed through the water.

A record of a ship’s speed, its progress, and any shipboard events of navigational importance.

The book in which this record is kept.

A record of a vehicle’s performance, as the flight record of an aircraft.

A record, as of the performance of a machine or the progress of an undertaking.