Definition of opportunist noun from the Oxford Advanced American Dictionary

 

opportunist

 noun
noun
NAmE//ˌɑpərˈtunɪst//
 
(often disapproving)
 
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a person who makes use of an opportunity, especially to get an advantage for himself or herself 80% of burglaries are committed by casual opportunists.
See the Oxford Advanced Learner's Dictionary entry: opportunist