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Definition of invasion:

  1. A warlike or hostile entrance into the possessions or domains of another; the incursion of an army for conquest or plunder.
  2. The act of invading; the act of encroaching upon the rights or possessions of another; encroachment; trespass.
  3. The incoming or first attack of anything hurtful or pernicious; as, the invasion of a disease.

Synonyms:

conquer, enter, occupy, trespass, seize, arrival, contagion, comings and goings, reentry, fester, antibody, besiege, defense, violation, irruption, encroachment, inroad, biosecurity, carrier, cross-contamination, cross-infection, homecoming, infringement, subjugate, invade, annex, defense mechanism, impingement, descent, impact, suppress, incursion, turnover, entry, ingress, candida, intrusion, subdue, onset, entrance, usurpation.

Usage examples: