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one-way

[wuhn-wey] /ˈwʌnˈweɪ/
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
1815-1825
1815-25
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for one-way
  • 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.
British Dictionary definitions for one-way

one-way

adjective
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for one-way
adj.

1906, in reference to travel tickets; 1914 in reference to streets; 1940 in reference to windows, mirrors, etc.; from one + way.

Online Etymology Dictionary, © 2010 Douglas Harper
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3
4
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