# invasion

Pronunciation: US say "in-VAY-zhuhn" /ɪnˈveɪʒən/; UK

## Noun

1. A military operation in which one country's armed forces enter territory controlled by another, usually to conquer land or overthrow its government.
   - Simple: An attack in which one country's army enters another country to take control of it.
   - _The invasion of the peninsula required months of careful planning._
   - _Coastal defenses were built to repel any future invasion._
2. The entry of a person or group, without permission, into a space where they are not wanted.
   - Simple: The act of entering a place or someone's private space when you are not welcome.
   - _Constant surveillance amounts to a serious invasion of personal privacy._
   - _Residents complained about the invasion of their neighborhood by weekend partygoers._
3. The spread of cancer cells, bacteria, or similar agents into the tissues of the body.
   - Simple: The way cancer cells or germs spread into the body.
   - _Tumor invasion into the lymph nodes worsened her prognosis._
   - _The invasion of the bloodstream by bacteria can trigger sepsis._
4. The breaching of the skin barrier, as occurs during a medical or surgical procedure.
   - Simple: The breaking of the skin, such as during a medical procedure.
   - _Minimally invasive surgery limits the invasion of the skin to a few small incisions._
   - _Each invasion of the skin during the operation was carefully sealed afterward._

## Origin

The word comes from Middle French "invasion", which in turn derives from Late Latin "invāsiōnem", the accusative form of "invāsiō".

Source: DictionaryAI, https://dictionaryai.com/define/invasion (written from Wiktionary data, CC BY-SA 4.0: https://creativecommons.org/licenses/by-sa/4.0/).