Here's the Meriam-Webster definition verbatim. There was no invasion of Iraq in 1991. There was no conquest of plunder. Accept it.

Main Entry:in£va£sion
Pronunciation:in-*v*-zh*n
Function:noun
Etymology:Middle English invasioune, from Anglo-French invasion, from Late Latin invasion-, invasio, from Latin invadere to invade
Date:15th century

1 : an act of invading; especially   : incursion of an army for conquest or plunder
2 : the incoming or spread of something usually hurtful