English

Definition of plane adjective from the Oxford Advanced Learner's Dictionary

 

plane

 adjective
adjective
BrE BrE//pleɪn//
 
; NAmE NAmE//pleɪn//
 
 
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[only before noun] (specialist) completely flat; level a plane surface Word Originadjective early 17th cent.: from Latin planum ‘flat surface’, neuter of the adjective planus ‘plain’. The adjective was suggested by French plan(e) ‘flat’. The word was introduced to differentiate the geometrical senses, previously expressed by plain, from its other meanings.
See the Oxford Advanced American Dictionary entry: plane