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English definition of “opportunist”

opportunist

adjective [usually before noun]     /ˌɒp.əˈtjuː.nɪst/ US  /ˌɑː.pɚˈtuː-/ usually disapproving
using a situation to get power or an advantage: The burglary was probably carried out by an opportunist thief who noticed the door was open.Advantage and disadvantage
(Definition of opportunist adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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