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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unidirectional is an adjective meaning "operating or moving or allowing movement in one direction only". It carries one recorded sense.
operating or moving or allowing movement in one direction only
“a unidirectional flow”
“a unidirectional antenna”
“a unidirectional approach to a problem”
Definitions, synonyms and semantic relations for unidirectional come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.