Definition of invader noun from the Oxford Advanced American Dictionary

     

    invader

     noun
    noun
    NAmE//ɪnˈveɪdər//
     
     
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  1. 1an army or a country that enters another country by force in order to take control of it; a soldier fighting in such an army a foreign invader They prepared to repel the invaders.
  2. 2(figurative) The white blood cells attack cells infected with an invader.
See the Oxford Advanced Learner's Dictionary entry: invader