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Aeronautics. a movable surface, usually near the trailing edge of a wing, that controls the roll of the airframe or effects maneuvers, as banks and the like.
a wall at the end of a roof with a single slope, as that of a church aisle.
Historical Examples

Wire, aileron Gap—A wire connecting top and bottom ailerons.
The Aeroplane Speaks H. Barber

They shot away my aileron control, and we were in a very bad way.
Some Naval Yarns Mordaunt Hall

After twenty minutes of this kind of thing he asked her to point out an aileron and explain its use.
Dorothy Dixon Wins Her Wings Dorothy Wayne

He slid his thumb across the black gun button as he set his windbreaker’s edge on a line with Allison’s aileron slit.
A Yankee Flier with the R.A.F. Rutherford G. Montgomery

If one wing tends to dip, the aileron on that side is depressed.
The New Gresham Encyclopedia. Vol. 1 Part 1 Various

He closed his mouth firmly and fixed his eyes on the aileron slit ahead.
A Yankee Flier with the R.A.F. Rutherford G. Montgomery

The part of the wing which can be warped is called the aileron.
The Romance of Aircraft Lawrence Yard Smith

That hinged movable auxiliary surface on the trailing edge of the wing is an aileron.
Dorothy Dixon Wins Her Wings Dorothy Wayne

In that way I depress the aileron on the side I want to sail.
Dorothy Dixon Wins Her Wings Dorothy Wayne

The aileron which is lowered catches the air currents flowing beneath the wing on that side.
The Romance of Aircraft Lawrence Yard Smith

noun
a flap hinged to the trailing edge of an aircraft wing to provide lateral control, as in a bank or roll
n.

1909, from French aileron, altered (by influence of aile “wing”), from French aleron “little wing,” diminutive of Old French ele “wing” (12c.), from Latin ala “wing” (see aisle).
aileron
(ā’lə-rŏn’)
A hinged surface that is part of the back edge of each wing on an airplane. The ailerons are moved up or down to create uneven lift on the sides of the plane to control its rolling and tilting movements.