co-pilot

copilot

[koh-pahy-luht]
noun
a pilot who is second in command of an aircraft.
Also called first officer.


Origin:
1925–30; co- + pilot

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Collins
World English Dictionary
copilot (ˈkəʊˌpaɪlət)
 
n
a second or relief pilot of an aircraft

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

copilot
1927, from co- + pilot (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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