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opportunistic

[op-er-too-nis-tik, -tyoo-] /ˌɒp ər tuˈnɪs tɪk, -tyu-/
adjective
1.
adhering to a policy of opportunism; practicing opportunism.
2.
Pathology.
  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.
Origin of opportunistic
1890-1895
First recorded in 1890-95; opportunist + -ic
Related forms
opportunistically, adverb
unopportunistic, adjective
Can be confused
opportune, opportunistic.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for opportunistically

opportunistic

/ˌɒpətjʊˈnɪstɪk/
adjective
1.
of or characterized by opportunism
2.
(med) (of an infection) caused by any microorganism that is harmless to a healthy person but debilitates a person whose immune system has been weakened by disease or drug treatment
Derived Forms
opportunistically, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for opportunistically

opportunistic

adj.

1889, see opportunist + -ic. Related: Opportunistically.

Online Etymology Dictionary, © 2010 Douglas Harper
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opportunistically in Medicine

opportunistic op·por·tun·is·tic (ŏp'ər-tōō-nĭs'tĭk, -tyōō-)
adj.

  1. Of or relating to an organism capable of causing disease only in a host whose resistance is lowered.

  2. Of or relating to a disease caused by an opportunistic organism.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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