round trip

noun
1.
a trip to a given place and back again: Fares for round trips often have a discount.
2.
a transportation ticket for such a trip.
3.
Pinochle. roundhouse ( def 4 ).

Origin:
1850–55, Americanism

round-trip, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
round trip
 
n
a trip to a place and back again, esp returning by a different route

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Idioms & Phrases

round trip

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 © 1997. Published by Houghton Mifflin.
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Example sentences
Latency is the delay caused by a network as a packet of data makes a round trip.
It makes the round trip back to mechanical energy to drive the vehicle.
The energy round trip wastes a lot of the efficiency, too.
We could send a round trip of midgets for less than half the cost of a one-way
  mission of average sized people.
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