| invade | (verb) march aggressively into another's territory by military force for the purposes of conquest and occupation | Synonyms: occupy |
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| (verb) penetrate or assault, in a harmful or injurious way | - |
| (verb) to intrude upon, infringe, encroach on, violate | Synonyms: encroach upon, intrude on, obtrude upon |
| (verb) occupy in large numbers or live on a host | Synonyms: infest, overrun |
| invaginate | (verb) fold inwards | Synonyms: introvert |
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| (verb) sheathe | - |
| invalid | (verb) injure permanently | Synonyms: disable, handicap, incapacitate |
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| (verb) force to retire, remove from active duty, as of firemen | - |
| invalidate | (verb) take away the legal force of or render ineffective | Synonyms: vitiate, void |
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| (verb) show to be invalid | Synonyms: nullify |
| (verb) make invalid for use | Synonyms: cancel |
| (verb) declare invalid | Synonyms: annul, avoid, nullify, quash, void |