Noun
1. a segment of the trunk of a tree when stripped of branches
2. large log at the back of a hearth fire
3. the exponent required to produce a given number
4. a written record of messages sent or received;
"they kept a log of all transmission by the radio station""an email log"5. a written record of events on a voyage (of a ship or plane)
6. measuring instrument that consists of a float that trails from a ship by a knotted line in order to measure the ship's speed through the water