log

A log is a piece of wood that is long and round that has been cut off a tree.

Example: We need another log to make a nice big fire.

A log is a place where people or computer programs write things when they happen, and they write the date (and maybe the time) every time they write something.

Example: We need to keep a log of everyone going into and out of this building.

In mathematics, a log is a logarithm.

When people log a forest, they cut down the trees to make logs.

Example: There was a forest here, but it was logged a few years ago.

When someone logs something, they write it in a log book.

Example: Make sure you log that so we'll remember what time it happened.