1.NounThe art or science of making and flying aircraft.
2.NounFlying, operating, or operation of aircraft.
"The history of aviation is full of daring pioneers.; He works in the aviation industry as a pilot.; Military aviation played a crucial role in the war."
3.NounIndustry that produces aircraft.
4.NounAircraft.
5.NounA cocktail made with gin, maraschino liqueur, crème de violette, and lemon juice.