[yoo-ni-di-rek-shuh-nl, -dahy-]
operating or moving in one direction only; not changing direction: a unidirectional flow.

1880–85; uni- + directional

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World English Dictionary
unidirectional (ˌjuːnɪdɪˈrɛkʃənəl, -daɪ-)
having, moving in, or operating in only one direction

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Example sentences
It's fair to say that so-called unidirectional amplifiers have had a profound impact on our society.
Clearly it is unidirectional, which makes it different than the others.
Most models of anticipation take for granted that events unfold in a unidirectional flow of time, from past to future.
When returns are in the walls, there are restrictions as to how wide the room can be and still maintain unidirectional flow.
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