I. ˈround-trip 1 BrE AmE noun [countable]
a journey to a place and back again:
a round-trip ticket from Los Angeles to New York
30 mile/360 kilometre/2 hour etc round trip
A coachload of supporters made the 700-mile round trip to South Devon.
round-trip of
It’s a round trip of 90 miles.
II. round-trip 2 BrE AmE adjective [only before noun] American English
a round-trip ticket includes the journey to a place and back again OPP one-way SYN return British English
—round trip adverb