noun in·va·sion \in-ˈvā-zhən\

Definition of INVASION

:  an act of invading; especially :  incursion of an army for conquest or plunder
:  the incoming or spread of something usually hurtful

Examples of INVASION

  1. The enemy launched an invasion.
  2. The people live under a constant threat of invasion.
  3. The town is gearing up for the annual tourist invasion.
  4. protecting the house from insect invasion

Origin of INVASION

Middle English invasioune, from Anglo-French invasion, from Late Latin invasion-, invasio, from Latin invadere to invade
First Known Use: 15th century


noun in·va·sion \in-ˈvā-zhən\   (Medical Dictionary)

Medical Definition of INVASION

:  the act of invading: as a :  the penetration of the body of a host by a microorganism b :  the spread and multiplication of a pathogenic microorganism or of malignant cells in the body of a host


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