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64-pounder a.b. A1 aback abaft abeam ablative able able-bodied aboard about abox abreast accommodation ladder acockbill acorn Admiral of the Fleet affreightment afloat afore aft aftcastle after after-sail afterbody afterdeck aftermost afterpeak afterpiece aftward agonic agonic line aground ahead

ahold ahoy ahull AIS all hands on deck allide allision almanac aloft alow ama amain America's Cup amidships anchor anchor buoy anchor's aweigh anchorage anchorman angle of attack answer the helm apeak apeek aplustre apparel arching arm the lead arming arrest artemon ashore astarboard astay

astern astern of astronavigation asymmetrical spinnaker at the helm ataunt athwart athwartship athwartships atrip attitude AUV auxiliary avast aweather awning aye aye, sir azimuth thruster azipod babystay back back and fill back water backstaff backstay backwash backwind badge baffling wind baggywrinkle bagpipe bail bail out