copilot

[koh-pahy-luh t]

Origin of copilot

First recorded in 1925–30; co- + pilot
Also called first officer.
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British Dictionary definitions for copilot

copilot

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

Word Origin and History for copilot
n.

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

Online Etymology Dictionary, © 2010 Douglas Harper