WordReference Random House Unabridged Dictionary of American English © 2020
able seaman, 
  1. Military, Naval TermsAlso called  able-bodied seaman. an experienced deck-department seaman qualified to perform routine sea duties.
  2. Military, Naval Terms(in the British Navy and on British and U.S. merchant ships) a rating between ordinary seaman and leading seaman or boatswain's mate. Abbr.: A.B., AB
  • 1695–1705

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