Entry 2 senses · 2 variants Webster, 1913 Multiplane · Mul·ti·plane · IPA a. n. 01 a. Having several or many planes or plane surfaces; as, a multiplane kite. 1. Having several or many planes or plane surfaces; as, a multiplane kite. 02 n. An airplane with three or more superposed main wings, such as a triplane. 1. An airplane with three or more superposed main wings, such as a triplane.(Aeronautics)