Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
adventitious is an adjective meaning "associated by chance and not an integral part". It carries one recorded sense.
associated by chance and not an integral part
“poetry is something to which words are the accidental, not by any means the essential form”
“they had to decide whether his misconduct was adventitious or the result of a flaw in his character”
Definitions, synonyms and semantic relations for adventitious come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.