| 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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| (verb) send a bill to | - |
| 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 |
| involucrate | (adjective) having an involucre | - |
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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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| involuntarily | (adverb) against one's will or done without conscious thought | - |
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| involuntariness | (noun) the trait of being unwilling | Synonyms: unwillingness |
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| involuntary | (adjective) not subject to the control of the will | Synonyms: nonvoluntary, unvoluntary |
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| (adjective) controlled by the autonomic nervous system; without conscious control | - |
| involute | (adjective) (of some shells) closely coiled so that the axis is obscured | - |
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| (adjective) especially of petals or leaves in bud; having margins rolled inward | Synonyms: rolled |
| 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) | - |
| 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 |
| involved | (adjective) connected by participation or association or use | - |
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| (adjective) emotionally involved | - |
| (adjective) highly complex or intricate and occasionally devious | Synonyms: Byzantine, convoluted, knotty, labyrinthine, tangled, tortuous |
| (adjective) enveloped | - |
| (adjective) entangled or hindered as if e.g. in mire | Synonyms: mired |
| 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 |