Definition of incursion noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ɪnˈkɜːʃn//
    ; NAmE NAmE//ɪnˈkɜːrʒn//
    incursion (into something) (formal)
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  1. 1a sudden attack on a place by foreign armies, etc. Border patrols were increased to deter further incursions by foreign forces. Government troops made an incursion into territory held by the rebels.
  2. 2the sudden appearance of something in a particular area of activity that is either not expected or not wanted
  3. Word Originlate Middle English (formerly also as encursion): from Latin incursio(n-), from the verb incurrere, from in- ‘towards’ + currere ‘run’.
See the Oxford Advanced American Dictionary entry: incursion