infestation

[in-fe-stey-shuhn]
noun
1.
the act of infesting; state of being infested.
2.
a harassing or troublesome invasion: an infestation of ants.

Origin:
1375–1425; late Middle English infestacio(u)n < Late Latin infestātiōn- (stem of infestātiō). See infest, -ation

reinfestation, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
infest (ɪnˈfɛst)
 
vb
1.  to inhabit or overrun in dangerously or unpleasantly large numbers
2.  (of parasites such as lice) to invade and live on or in (a host)
 
[C15: from Latin infestāre to molest, from infestus hostile]
 
infes'tation
 
n
 
in'fester
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Bt breaks down quickly in sunlight, and several applications may be required to
  control an infestation.
If the infestation is light, cut off and burn infected stems and branches.
If the infestation is severe, pairs of traps may be required in several runways.
It is an unprecedented infestation that could become a catastrophe.
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