| invader | (noun) someone who enters by force in order to conquer | Synonyms: encroacher |
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| 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 | (noun) someone who is incapacitated by a chronic illness or injury | Synonyms: shut-in |
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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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| 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 | (noun) a quantity that does not vary | Synonyms: constant, constant quantity |
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| invariableness | (noun) the quality of being resistant to variation | Synonyms: invariability, invariance |
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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 | (noun) a feature (quantity or property or function) that remains unchanged when a particular transformation is applied to it | - |
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| 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 | - |
| 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. | - |