| 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 |
| invader | (noun) someone who enters by force in order to conquer | Synonyms: encroacher |
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| invading | (adjective) involving invasion or aggressive attack | Synonyms: incursive, invasive |
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| invaginate | (verb) fold inwards | Synonyms: introvert |
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| (verb) sheathe | - |
| invagination | (noun) the folding in of an outer layer so as to form a pocket in the surface | Synonyms: infolding, introversion, intussusception |
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| (noun) the condition of being folded inward or sheathed | Synonyms: introversion |
| invalid | (adjective) having no cogency or legal force | - |
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| (adjective) no longer valid | - |
| (noun) someone who is incapacitated by a chronic illness or injury | Synonyms: shut-in |
| (verb) injure permanently | Synonyms: disable, handicap, incapacitate |
| (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 |
| invalidated | (adjective) deprived of legal force | Synonyms: nullified |
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| invalidating | (adjective) establishing as invalid or untrue | Synonyms: disconfirming |
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| invalidation | (noun) (law) a formal termination (of a relationship or a judicial proceeding etc) | Synonyms: annulment |
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| (noun) when a person's thoughts and feelings are rejected, ignored, or judged. | - |
| invalidator | (noun) an official who can invalidate or nullify | Synonyms: nullifier, voider |
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| invalidism | (noun) chronic ill health | - |
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| invalidity | (noun) illogicality as a consequence of having a conclusion that does not follow from the premisses | Synonyms: invalidness |
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| invalidness | (noun) illogicality as a consequence of having a conclusion that does not follow from the premisses | Synonyms: invalidity |
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| invaluable | (adjective) having incalculable monetary, intellectual, or spiritual worth | Synonyms: priceless |
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| invaluableness | (noun) the positive quality of being precious and beyond value | Synonyms: preciousness, pricelessness, valuableness |
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| invariability | (noun) the quality of being resistant to variation | Synonyms: invariableness, invariance |
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| (noun) a quality of uniformity and lack of variation | Synonyms: evenness |
| invariable | (adjective) not liable to or capable of change | - |
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| (noun) a quantity that does not vary | Synonyms: constant, constant quantity |
| invariableness | (noun) the quality of being resistant to variation | Synonyms: invariability, invariance |
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| invariably | (adverb) without variation or change, in every case | Synonyms: always, constantly |
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| invariance | (noun) the quality of being resistant to variation | Synonyms: invariability, invariableness |
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| (noun) the nature of a quantity or property or function that remains unchanged when a given transformation is applied to it | - |
| invariant | (adjective) unvarying in nature | Synonyms: changeless, constant, unvarying |
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| (adjective) unaffected by a designated operation or transformation | - |
| (noun) a feature (quantity or property or function) that remains unchanged when a particular transformation is applied to it | - |
| invasion | (noun) the act of invading; the act of an army that invades for conquest or plunder | - |
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| (noun) any entry into an area not previously occupied | Synonyms: encroachment, intrusion |
| (noun) (pathology) the spread of pathogenic microorganisms or malignant cells to new sites in the body | - |
| invasive | (adjective) marked by a tendency to spread especially into healthy tissue | - |
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| (adjective) relating to a technique in which the body is entered by puncture or incision | - |
| (adjective) gradually intrusive without right or permission | Synonyms: encroaching, trespassing |
| (adjective) involving invasion or aggressive attack | Synonyms: incursive, invading |
| invasiveness | (noun) The quality of involving entry into the living body (as by incision or by insertion of an instrument). | - |
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| (noun) The quality of tending to spread; especially of tending to invade healthy tissue. | - |