| 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 |
| inveigh | (verb) complain bitterly | Synonyms: rail |
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| (verb) speak against in an impassioned manner | Synonyms: declaim |
| inveigle | (verb) influence or urge by gentle urging, caressing, or flattering | Synonyms: blarney, cajole, coax, palaver, sweet-talk, wheedle |
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| invent | (verb) come up with (an idea, plan, explanation, theory, or principle) after a mental effort | Synonyms: contrive, devise, excogitate, forge, formulate |
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| (verb) concoct something artificial or untrue | Synonyms: cook up, fabricate, make up, manufacture |
| inventory | (verb) make or include in an itemized record or report | Synonyms: stock-take, take stock |
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| invert | (verb) turn inside out or upside down | Synonyms: reverse, turn back |
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| (verb) make an inversion (in a musical composition) | - |
| (verb) reverse the position, order, relation, or condition of | Synonyms: reverse |
| invest | (verb) make an investment | Synonyms: commit, place, put |
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| (verb) provide with power and authority | Synonyms: enthrone, vest |
| (verb) place ceremoniously or formally in an office or position | Synonyms: induct, seat |
| (verb) furnish with power or authority; of kings or emperors | Synonyms: adorn, clothe |
| (verb) give qualities or abilities to | Synonyms: empower, endow, endue, gift, indue |
| investigate | (verb) investigate scientifically | Synonyms: look into |
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| (verb) conduct an inquiry or investigation of | Synonyms: enquire, inquire |
| invigilate | (verb) watch over (students taking an exam, to prevent cheating) | Synonyms: proctor |
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| invigorate | (verb) impart vigor, strength, or vitality to | Synonyms: reinvigorate |
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| (verb) make lively | Synonyms: animate, enliven, liven, liven up |
| (verb) give life or energy to | Synonyms: quicken |
| (verb) heighten or intensify | Synonyms: animate, enliven, exalt, inspire |
| invite | (verb) ask someone in a friendly way to do something | Synonyms: bid |
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| (verb) request the participation or presence of | Synonyms: call for |
| (verb) ask to enter | Synonyms: ask in |
| (verb) express willingness to have in one's home or environs | Synonyms: receive, take in |
| (verb) give rise to a desire by being attractive or inviting | Synonyms: tempt |
| (verb) increase the likelihood of | Synonyms: ask for |
| (verb) invite someone to one's house | Synonyms: ask over, ask round |
| (verb) have as a guest | Synonyms: pay for |
| invoice | (verb) send a bill to | - |
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| invoke | (verb) cite as an authority; resort to | Synonyms: appeal |
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| (verb) request earnestly (something from somebody); ask for aid or protection | Synonyms: appeal |
| (verb) summon into action or bring into existence, often as if by magic | Synonyms: arouse, bring up, call down, call forth, conjure, conjure up, evoke, put forward, raise, stir |
| involve | (verb) make complex or intricate or complicated | - |
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| (verb) occupy or engage the interest of | - |
| (verb) have as a necessary feature | Synonyms: imply |
| (verb) connect closely and often incriminatingly | Synonyms: affect, regard |
| (verb) contain as a part | - |
| (verb) engage as a participant | - |
| (verb) require as useful, just, or proper | Synonyms: ask, call for, demand, necessitate, need, postulate, require, take |