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copilot

[koh-pahy-luh t] /ˈkoʊˌpaɪ lət/
noun
1.
a pilot who is second in command of an aircraft.
Also called first officer.
Origin
1925-1930
1925-30; co- + pilot
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for co-pilot

copilot

/ˈkəʊˌpaɪlət/
noun
1.
a second or relief pilot of an aircraft
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for co-pilot

copilot

n.

1927, from co- + pilot (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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Slang definitions & phrases for co-pilot

copilot

noun

An amphetamine taken in order to stay awake (1960s+ Truckers)


The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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