1. (n.) An officer who ranks next above a captain; sometimes, by courtesy, the senior captain of a squadron. The rank of commodore corresponds with that of brigadier general in the army.

2. (n.) A captain commanding a squadron, or a division of a fleet, or having the temporary rank of rear admiral.

3. (n.) A title given by courtesy to the senior captain of a line of merchant vessels, and also to the chief officer of a yachting or rowing club.

4. (n.) A familiar for the flagship, or for the principal vessel of a squadron or fleet.

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