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opportunistic

[op-er-too-nis-tik, -tyoo-]
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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.
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Origin of opportunistic

First recorded in 1890–95; opportunist + -ic
Related formsop·por·tun·is·ti·cal·ly, adverbun·op·por·tun·is·tic, adjective
Can be confusedopportune opportunistic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for opportunistic

practical, selfish, urbane, cosmopolitan, hardened, gracious, polite, conciliatory, strategic, eager, avaricious, callous, cool, covetous, disenchanted, grasping, greedy, knowing, self-centered, unprincipled

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Contemporary Examples of opportunistic

Historical Examples of opportunistic


British Dictionary definitions for opportunistic

opportunistic

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
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Derived Formsopportunistically, 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

Word Origin and History for opportunistic

adj.

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

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Online Etymology Dictionary, © 2010 Douglas Harper

opportunistic in Medicine

opportunistic

(ŏp′ər-tōō-nĭstĭk)
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.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.