unidirectional

[ yoo-ni-di-rek-shuh-nl, -dahy- ]
/ ˌyu nɪ dɪˈrɛk ʃə nl, -daɪ- /

adjective

operating or moving in one direction only; not changing direction: a unidirectional flow.

Origin of unidirectional

First recorded in 1880–85; uni- + directional
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for unidirectional

unidirectional

/ (ˌjuːnɪdɪˈrɛkʃənəl, -daɪ-) /

adjective

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