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One who operates or is licensed to operate an aircraft in flight.
(noun)
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Nautical One who, though not belonging to a ship's company, is licensed to conduct a ship into and out of port or through dangerous waters.
(noun)
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Nautical The helmsman of a ship.
(noun)
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One who guides or directs a course of action for others.
(noun)
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The part of a tool, device, or machine that leads or guides the whole.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.