1. a. A personal record of occurrences, experiences, and reflections kept on a regular basis; a diary. b. An official record of daily proceedings, as of a legislative body. c. Nautical. A ship's log.

2. Accounting. a. A daybook. b. A book of original entry in a double-entry system, listing all transactions and indicating the accounts to which they belong.

3. A newspaper.

4. A periodical presenting articles on a particular subject: a medical journal.

5. The part of a machine shaft or axle supported by a bearing.