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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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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

copilot
1927, from co- + pilot (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The certificated commercial pilot was seriously injured, and the commercial-rated copilot was fatally injured.
Pay for flight engineers can be low, but earnings increase significantly as workers advance to copilot and pilot positions.
Designate a copilot that can help you use other electronics in the car such as your navigation system or the radio.
Federal denied coverage because the copilot had not undergone the training mandated by the policy's pilot warranty.
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