Webster's English Dictionary

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commodore

com.mo.dore \'ka:m-*-.do-(*)r, -.do.(*)r\ n [prob. modif. of D commandeur 
   commander, fr. F, fr. OF comandeor, f]r. comander to command 1: a 
   commissioned officer in the navy ranking above a captain and below a r ear 
   admiral 2: the ranking officer commanding a body of merchant ships  3: the 
   chief officer of a yacht club or boating association