one-way

[wuhn-wey]
adjective
1.
moving, or allowing movement in one direction only: a one-way street.
2.
valid for travel in one direction only: a one-way ticket. Compare round trip.
3.
without a reciprocal feeling, responsibility, relationship, etc.: It's a one-way friendship.
4.
not intended for return to a seller, dealer, etc., for reuse; disposable: one-way bottles.

Origin:
1815–25

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
one-way
 
adj
1.  moving or allowing travel in one direction only: one-way traffic
2.  entailing no reciprocal obligation, action, etc: a one-way agreement

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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Etymonline
Word Origin & History

one-way
1906, in ref. to travel tickets; 1914 in ref. to streets; 1940 in ref. to windows, mirrors, etc.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Multiple agency actions and/or communication is not a one-way street.
Blocking a ray from one direction and allowing in a ray from the other could be useful for making a one-way street for light.
To calculate one-way fares enter your destination into trip planner.
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