invasion

Noun
  1. is a type of: incursion, penetration - an attack that penetrates into enemy territory
    subtypes: inroad - an invasion or hostile attack
  2. is a type of: entering, entrance - a movement into or inward
    same as: encroachment, intrusion
  3. referred to in: medical specialty, medicine - the branches of medical science that deal with nonsurgical techniques
    is a type of: spread, spreading - process or result of distributing or extending over a wide expanse of space

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