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invade (v.)

"enter in a hostile manner," late 15c., from Latin invadere "to go, come, or get into; enter violently, penetrate into as an enemy, assail, assault, make an attack on," from in- "in" (from PIE root *en "in") + vadere "go, walk" (see vamoose). Compare evade. Related: invaded; invading.

Origin and meaning of invade

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Definitions of invade from WordNet

invade (v.)
march aggressively into another's territory by military force for the purposes of conquest and occupation;
Hitler invaded Poland on September 1, 1939
Synonyms: occupy
invade (v.)
to intrude upon, infringe, encroach on, violate;
This new colleague invades my territory
Synonyms: intrude on / obtrude upon / encroach upon
invade (v.)
occupy in large numbers or live on a host;
Synonyms: overrun / infest
invade (v.)
penetrate or assault, in a harmful or injurious way;
The cancer had invaded her lungs
From wordnet.princeton.edu