Definition of commodore
1a
: a captain in the navy in command of a squadron
b
: a commissioned officer in the navy formerly ranking above captain and below rear admiral and having an insignia of one star
2
: the ranking officer commanding a body of merchant ships
3
: the chief officer of a yacht club or boating association
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Merriam-Webster unabridged
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Time Traveler for commodore
The first known use of commodore was in 1695
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