Webster's English Dictionary

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invasion

in.va.sion \in-'va--zh*n\ n [ME invasioune, fr. MF invasion, fr. LL 
   invasion-, invasio], fr. L invasus, pp. of invadere 1: an act of invading; 
   esp : incursion of an army for conquest or p lunder 2: the incoming or 
   spread of something usu. hurtful