1.NounA powered heavier-than-air aircraft with fixed wings: a fixed-wing aircraft with at least one engine or electric motor.
"jet airplane; They use airplanes to deliver mail and supplies to the far northern villages."
2.NounOne that can carry a person or persons.
"They use airplanes to deliver mail and supplies to the far northern villages."
3.NounAny of various small flyable objects that are notionally comparable to such aircraft but aren't powered.
"toy airplane"
4.NounA game to encourage small children to eat, in which the parent or carer pretends that a spoonful of food is an aircraft flying into the child's mouth; the spoonful itself.