Definition of en route adverb from the Oxford Advanced Learner's Dictionary

 

en route

 adverb
adverb
BrE BrE//ˌɒ̃ ˈruːt//
 
; NAmE NAmE//ˌɑ̃ː ˈruːt//
 
; BrE BrE//ˌɒn ˈruːt//
 
; NAmE NAmE//ˌɑːn ˈruːt//
 
(from French)
 
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on the way; while travelling from/to a particular place We stopped for a picnic en route. en route (from…) (to…) The bus broke down en route from Boston to New York. (British English) en route (for…) a plane en route for Heathrow Word Origin late 18th cent.: French from Old French rute ‘road’.
See the Oxford Advanced American Dictionary entry: en route