Definition of incursion noun from the Oxford Advanced American Dictionary

     

    incursion

     noun
    noun
    NAmE//ɪnˈkərʒn//
     
    incursion (into something)(formal)
     
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  1. 1a sudden attack on a place by foreign armies, etc.
  2. 2the sudden appearance of something in a particular area of activity that is either not expected or not wanted
See the Oxford Advanced Learner's Dictionary entry: incursion