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1. adjective Of or relating to both the outgoing and return portions of a journey. The flights will cost about $800 round trip. The round-trip drive will amount to about 30 hours in the car.
2. noun Such a journey considered as a whole. Rather than buying tickets for a round trip, I decided to buy a one-way ticket and leave it open ended as to when and how I would get home.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
A journey to a given place and back again, usually over the same route; also, a ticket for such a trip. For example, The fare for a round trip is generally lower than for two one-way journeys. [Mid-1800s]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.