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1.
The control surfaces found on the outboard sections of an airplane's wing. They move up and down and control the roll of the airplane, turning it.

Aileron is from the French for "Little wing."
Before every flight, I check the ailerons to make sure they are working properly.
by Athene Airheart May 15, 2004
 
2.
Plural for aileron. Part of an airplane's wing.
It is very hard to turn an airplane if you don't use ailerons.
by Athene Airheart May 15, 2004