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Adjective: unidirectional  ,yoo-ni-du'rek-shu-nul
  1. Operating, moving or allowing movement in one direction only
    "a unidirectional flow"; "a unidirectional antenna"; "a unidirectional approach to a problem"

See also: one-way, simplex, unifacial

Antonym: bidirectional

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unicorn
unicorn root
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unicycle
unicyclist
unidentifiable
unidentified
unidentified flying object
unidimensional
unidirectional
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Unification Church
unified
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unifilar
unifoliate
uniform
uniform acceleration
uniform resource locator