/ ˌɒ͂ ˈruːt; ˌɒn; NAmE ˌɑ͂ː; ˌɑːn/ adverb
en route (from ... ) (to ... ) | ( BrE ) en route (for ... ) (from French ) on the way; while travelling from / to a particular place :
We stopped for a picnic en route.
The bus broke down en route from Boston to New York.
a plane en route for Heathrow
••
WORD ORIGIN
late 18th cent.: French from Old French rute road.