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unidirectional

[yoo-ni-di-rek-shuh-nl, -dahy-] /ˌyu nɪ dɪˈrɛk ʃə nl, -daɪ-/
adjective
1.
operating or moving in one direction only; not changing direction:
a unidirectional flow.
Origin of unidirectional
1880-1885
First recorded in 1880-85; uni- + directional
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for unidirectional

unidirectional

/ˌjuːnɪdɪˈrɛkʃənəl; -daɪ-/
adjective
1.
having, moving in, or operating in only one direction
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 unidirectional
adj.

1883, from uni- + directional (see direction).

Online Etymology Dictionary, © 2010 Douglas Harper
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