invasion

Etymology

From Middle French invasion, from Late Latin invāsiōnem, accusative of invāsiō.

noun

1. A military action consisting of armed forces of one geopolitical entity entering territory controlled by another such entity, generally with the objective of conquering territory or altering the established government.
   Yeh actually works in marketing, and his weapon is a replica -- but he is spending the weekend attending an urban warfare workshop to prepare for what he sees as the very real threat of a Chinese invasion. 07/07/2022, “Inspired by Ukraine, civilians study urban warfare in Taiwan”, in France 24, archived from the original on 2022-07-07
2. The entry without consent of an individual or group into an area where they are not wanted.
   an invasion of mobile phones
   an invasion of bees
   an invasion of foreign tourists
3. (medicine) The spread of cancer cells, bacteries and such to the organism.
4. (surgery) The breaching of the skin barrier.