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The Collaborative International Dictionary
opportunistic

opportunistic \opportunistic\ adj.

  1. taking immediate advantage, often unethically, of any circumstance of possible benefit; practising opportunism.

    Syn: opportunist, timeserving.

  2. (Med.) Causing disease only when the immune system of the host has been weakened, or other damage to the host provides special opportunity for invasion; -- of microorganisms or infectious diseases; as, opportunistic pathogens may infect a burn site; AIDS predisposes a patient to opportunistic infection.

Douglas Harper's Etymology Dictionary
opportunistic

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

Wiktionary
opportunistic

a. 1 take advantage of of situations that arise 2 said of people who will take advantage of situations to advance their own interests, without regard for principles

WordNet
opportunistic

adj. taking immediate advantage, often unethically, of any circumstance of possible benefit [syn: opportunist, timeserving]

Wikipedia

Usage examples of "opportunistic".

Church by splitting it in two, and uniting opportunistic Fluxlords and Anchors chafing at the old system to create an empire that had at its height spanned more than half of World.

Nor would Lyk have teased him even slightly had he known the truth, for he was a good-hearted, if impetuous and opportunistic, youth at heart.

What I am trying to convey is that the Shearwaters have always been opportunistic parasites without an ounce of morality between them.

And, indeed, the presence of other opportunistic infections such as esophagal yeast infections confirmed immunosuppression in all of these early cases.

The ancestors of the true carnivores, which would eventually include the dogs and cats, were still small, ferretlike animals, busy, opportunistic general feeders.

The muttas hatched their eggs on the ground, as their ancestors had always done, which made them vulnerable to opportunistic predators like the burrowers.

I can't say I'm surprised to hear that the opportunistic sons-of-bitches think the time has come to start carving off the choicer bits.

One aids patient was suffering from a rare opportunistic disease called cryptosporidiosis, normally found only in calves.

The momentary madness was over and Marcel, who was obviously as opportunistic as he was sadistic, had picked up my jacket and was going through it hopefully but unsuccessfully, for wallets carried in the inner breast pocket of a jacket invariably fall out when that jacket is carried over the arm and I'd prudently transferred my wallet with its money, passport and driving licence to my hip pocket.

The effects can be sufficiently debilitating to incapacitate 80 percent of a workforce, with such consequences as preventing harvesting of a food crop, thus rendering a population vulnerable to all of the opportunistic threats that come with malnutrition and an impaired immune system, such as hepatitis, tuberculosis, dysentery, and typhoid fever.

The giant forest pig, Hylochoerus meinertzhageni, six teats and thirty-eight chromosomes, a resourceful feeder, an opportunistic omnivore, like man.

This is what Mason sent to his breeders in Sardinia to prepare the theater of Dr Lecter's death: The giant forest pig, Hylochoerus meinertzhageni, six teats and thirty-eight chromosomes, a resourceful feeder, an opportunistic omnivore, like man.

If that report was accurate and Jesmin returned to the fight, she'd probably lose maneuverability fast—and that would make her an easy target for opportunistic TIE pilots.

Enoch Root explains that this is a place where a small lahar, which had been funneled between the steep walls of the river's gorge farther upstream, spread out and mowed down a few hectares of ancient trees, clearing the path for smaller, opportunistic vegetation.

Enoch Root explains that this is a place where a small lahar, which had been funneled between the steep walls of the river’s gorge farther upstream, spread out and mowed down a few hectares of ancient trees, clearing the path for smaller, opportunistic vegetation.