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From The Collaborative International Dictionary of English v.0.48:
Nautical \Nau"tic*al\, a. [L. nauticus, Gr. naytiko`s, fr. nay`ths a seaman, sailor, fr. nay^s ship: cf. F. nautique. See Nave of a church.] Of or pertaining to seamen, to the art of navigation, or to ships; as, nautical skill. [1913 Webster] Syn: Naval; marine; maritime. See Naval. [1913 Webster] Nautical almanac. See under Almanac. Nautical distance, the length in nautical miles of the rhumb line joining any two places on the earth's surface. nautical mile. See under Mile. [1913 Webster]