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English definition of “adventitious”

adventitious

adjective     /ˌæd.vənˈtɪʃ.əs/ /-ven-/ formal
not expected or planned : an adventitious event / situation Not expected or planned adventitiously     /-li/ adverb
(Definition of adventitious adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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