1. a hostile entrance into or invasion of a place or territory, especially a sudden one; raid: The bandits made brief incursions on the village.
  2. a harmful inroad.
  3. a running in: the incursion of sea water.


  1. a sudden invasion, attack, or raid
  2. the act of running or leaking into; penetration

“hostile attack,” early 15c., from Middle French incursion (14c.) or directly from Latin incursionem (nominative incursio) “a running against,” noun of action from past participle stem of incurrere (see incur).

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