Etymology
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adventitious (adj.)

"of the nature of an addition from without, not from the essence of the subject; accidentally or casually acquired," c. 1600, from Medieval Latin adventitius "coming from abroad, extraneous," a corruption of Latin adventicius "foreign, strange, accidental," from advent- past participle stem of advenire "to arrive at, reach, come to" (see advent). Related: Adventitiously; adventitiousness.

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Definitions of adventitious

adventitious (adj.)
associated by chance and not an integral part; "poetry is something to which words are the accidental, not by any means the essential form"- Frederick W. Robertson;
they had to decide whether his misconduct was adventitious or the result of a flaw in his character
From wordnet.princeton.edu