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Meaning of opportunistic

op•por•tun•is•tic

Pronunciation: (op"ur-t-nis'tik, -ty-), [key]
— adj.
  1. adhering to a policy of opportunism; practicing opportunism.
  2. Pneumocystis pneumonia is an opportunistic disease that often strikes victims of AIDS.
    1. (of a microorganism) causing disease only under certain conditions, as when a person's immune system is impaired.
    2. (of a disease or infection) caused by such an organism:Pneumocystis pneumonia is an opportunistic disease that often strikes victims of AIDS.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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