Definitions for "Ailerons"
the moving section of the trailing edge of the wing, located towards the outer end. Ailerons come in pairs, (left and right) and always work in opposite directions to each other (one up, one down). When used, they cause the airplane to roll to the left or right. More details here.
A moveable part of the wings on an airplane that control pitching and banking movements.
interconnected flaps at the rear of the wings which move in opposite directions, allowing the plane to roll (bank).