English

Definition of adventitious adjective from the Oxford Advanced Learner's Dictionary

 

adventitious

 adjective
adjective
BrE BrE//ˌædvenˈtɪʃəs//
 
; NAmE NAmE//ˌædvenˈtɪʃəs//
 
(formal)
 
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happening by accident; not planned Word Origin early 17th cent.: from Latin adventicius ‘coming to us from abroad’ (from advenire ‘arrive’) + -ous.
See the Oxford Advanced American Dictionary entry: adventitious