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say it: in-VAY-zhuhn
invasion is a noun meaning "the act of invading; the act of an army that invades for conquest or plunder". It is pronounced /ˌɪnˈveɪʒən/ — in-VAY-zhuhn. It carries 3 recorded senses.
the act of invading; the act of an army that invades for conquest or plunder
any entry into an area not previously occupied
“an invasion of tourists”
“an invasion of locusts”
(pathology) the spread of pathogenic microorganisms or malignant cells to new sites in the body
“the tumor's invasion of surrounding structures”
medicine
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for invasion come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.