| invocation | (noun) the act of appealing for help | - |
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| (noun) calling up a spirit or devil | Synonyms: conjuration, conjuring, conjury |
| (noun) a prayer asking God's help as part of a religious service | Synonyms: supplication |
| (noun) an incantation used in conjuring or summoning a devil | - |
| invoice | (noun) an itemized statement of money owed for goods shipped or services rendered | Synonyms: account, bill |
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| involucre | (noun) a highly conspicuous bract or bract pair or ring of bracts at the base of an inflorescence | - |
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| involuntariness | (noun) the trait of being unwilling | Synonyms: unwillingness |
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| involution | (noun) the action of enfolding something | Synonyms: enfolding |
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| (noun) the process of raising a quantity to some assigned power | Synonyms: exponentiation |
| (noun) the act of sharing in the activities of a group | Synonyms: engagement, involvement, participation |
| (noun) marked by elaborately complex detail | Synonyms: elaborateness, elaboration, intricacy |
| (noun) a long and intricate and complicated grammatical construction | - |
| (noun) reduction in size of an organ or part (as in the return of the uterus to normal size after childbirth) | - |
| involvement | (noun) the act of sharing in the activities of a group | Synonyms: engagement, involution, participation |
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| (noun) a sense of concern with and curiosity about someone or something | Synonyms: interest |
| (noun) a connection of inclusion or containment | - |
| (noun) a usually secretive or illicit sexual relationship | Synonyms: affair, affaire, amour, intimacy, liaison |
| (noun) the condition of sharing in common with others (as fellows or partners etc.) | Synonyms: participation |