In telecommunications, round-trip delay (RTD) or round-triptime (RTT) is the amount of time it takes for a signal to be sent plus the amount of time it takes for acknowledgement of that signal having been received. This time delay includes propagation times for the paths between the two communication endpoints.
If you make a roundtrip, you travel to a place and then back again.
The train operates the 2,400-mile roundtrip once a week.
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A round-trip ticket is a ticket for a train, bus, or plane that allows you to travel to a particular place and then back again. (AM; in BRIT, use return )
Mexicana Airlines has announced cheaper round-trip tickets between Los Angeles and cities it serves in Mexico.