| v. t. | 1. | |
| 1. | To go into or upon; to pass within the confines of; to enter; - used of forcible or rude ingress. | |
| 2. | To enter with hostile intentions; to enter with a view to conquest or plunder; to make an irruption into; to attack; | |
| 3. | To attack; to infringe; to encroach on; to violate; | |
| 4. | To grow or spread over; to affect injuriously and progressively; | |
| v. i. | 1. | To make an invasion. |
| Verb | 1. | invade - 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 |
| 2. | invade - to intrude upon, infringe, encroach on, violate; "This new colleague invades my territory"; "The neighbors intrude on your privacy" | |
| 3. | invade - occupy in large numbers or live on a host; "the Kudzu plant infests much of the South and is spreading to the North" | |
| 4. | invade - penetrate or assault, in a harmful or injurious way; "The cancer had invaded her lungs" |