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

opportunistic

adjective
 
/ˌɒpətjuːˈnɪstɪk/
 
/ˌɑːpərtuːˈnɪstɪk/
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  1. (also opportunist)
     (disapproving) making use of an opportunity, especially to get an advantage for yourself; not done in a planned way
  2. [only before noun] (medical) harmful to people whose immune system has been made weak by disease or drugs
    • an opportunistic infection
See opportunistic in the Oxford Advanced American DictionarySee opportunistic in the Oxford Learner's Dictionary of Academic English
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trait
noun
 
 
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