Webster's English Dictionary

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commander

com.mand.er \k*-'man-d*r\ \-.ship\ n 1: one in an official position of 
   command or control : as  1a: COMMANDING OFFICER  1b: the presiding officer 
   of a society or organization  2: a commissioned officer in the navy ranking 
   above a lieutenant commander  and below a captain - com.mand.er.ship n