unidirectional
adjective
uni·di·rec·tion·al
ˌyü-ni-də-ˈrek-sh(ə-)nəl
-dī-
1
: involving, functioning, moving, or responsive in a single direction
a unidirectional microphone
2
: not subject to change or reversal of direction
unidirectionally
adverb
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Merriam-Webster unabridged
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