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“invasion” in Latin

The English word invasion itself goes back to Latin vādō, through invāsiōnem.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

invasion
irruptio: incursio: incursus. To make an invasion, irruptionem or incursionem facere in, etc. Vid: To INVADE.

Quick answer

What is the Latin word for invasion?
The usual Latin words for “invasion” are irruptiō, incursiō, incurrō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.