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



BrE BrE//ɪnˈveɪdə(r)//
; NAmE NAmE//ɪnˈveɪdər//
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an 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. (figurative) The white blood cells attack cells infected with an invader.
See the Oxford Advanced American Dictionary entry: invader