Entry 1 sense Webster, 1913 airplane · air·plane · IPA /ˈɛɹˌpleɪ̯n/ 01 n. a heavier-than-air aircraft. Same as aeroplane{2}. 1. a heavier-than-air aircraft. Same as aeroplane{2}. Also: <er>aeroplane{2}</er> See: aeroplane{2}