| invective | (noun) abusive or venomous language used to express blame or censure or bitter deep-seated ill will | Synonyms: vitriol, vituperation |
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| 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 |
| invention | (noun) the act of inventing | - |
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| (noun) a creation (a new device or process) resulting from study and experimentation | Synonyms: innovation |
| (noun) the creation of something in the mind | Synonyms: conception, design, excogitation, innovation |
| inventive | (adjective) (used of persons or artifacts) marked by independence and creativity in thought or action | Synonyms: imaginative |
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| inventively | (adverb) in an inventive manner | - |
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| inventiveness | (noun) the power of creative imagination | Synonyms: cleverness, ingeniousness, ingenuity |
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| inventor | (noun) someone who is the first to think of or make something | Synonyms: artificer, discoverer |
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| inventory | (noun) making an itemized list of merchandise or supplies on hand | Synonyms: inventorying, stock-taking, stocktaking |
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| (noun) the merchandise that a shop has on hand | Synonyms: stock |
| (noun) a collection of resources | Synonyms: armory, armoury |
| (noun) a detailed list of all the items in stock | Synonyms: stock list |
| (noun) (accounting) the value of a firm's current assets including raw materials and work in progress and finished goods | - |
| (verb) make or include in an itemized record or report | Synonyms: stock-take, take stock |
| inventorying | (noun) making an itemized list of merchandise or supplies on hand | Synonyms: inventory, stock-taking, stocktaking |
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| inverse | (adjective) opposite in nature or effect or relation to another quantity | - |
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| (adjective) reversed (turned backward) in order or nature or effect | Synonyms: reverse |
| (noun) something inverted in sequence or character or effect | Synonyms: opposite |
| inversely | (adverb) in an inverse or contrary manner | Synonyms: reciprocally |
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| inversion | (noun) turning upside down; setting on end | Synonyms: upending |
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| (noun) the act of turning inside out | Synonyms: eversion, everting |
| (noun) a term formerly used to mean taking on the gender role of the opposite sex | Synonyms: sexual inversion |
| (noun) the reversal of the normal order of words | Synonyms: anastrophe |
| (noun) (counterpoint) a variation of a melody or part in which ascending intervals are replaced by descending intervals and vice versa | - |
| (noun) (genetics) a kind of mutation in which the order of the genes in a section of a chromosome is reversed | - |
| (noun) the layer of air near the earth is cooler than an overlying layer | - |
| (noun) a chemical process in which the direction of optical rotation of a substance is reversed from dextrorotatory to levorotary or vice versa | - |
| (noun) abnormal condition in which an organ is turned inward or inside out (as when the upper part of the uterus is pulled into the cervical canal after childbirth) | - |
| 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 |
| invertase | (noun) an enzyme that catalyzes the hydrolysis of sucrose into glucose and fructose | Synonyms: saccharase, sucrase |
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| invertebrate | (adjective) lacking a backbone or spinal column | Synonyms: spineless |
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| (noun) any animal lacking a backbone or notochord; the term is not used as a scientific classification | - |
| inverted | (adjective) (of a plant ovule) completely inverted; turned back 180 degrees on its stalk | Synonyms: anatropous |
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| (adjective) being in such a position that top and bottom are reversed | Synonyms: upside-down |
| inverter | (noun) an electrical converter that converts direct current into alternating current | - |
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| invertible | (adjective) having an additive or multiplicative inverse | - |
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| 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 |
| investigating | (noun) the work of inquiring into something thoroughly and systematically | Synonyms: investigation |
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| investigation | (noun) the work of inquiring into something thoroughly and systematically | Synonyms: investigating |
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| (noun) an inquiry into unfamiliar or questionable activities | Synonyms: probe |
| investigative | (adjective) designed to find information or ascertain facts | Synonyms: fact-finding, investigatory |
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| investigator | (noun) someone who investigates | - |
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| (noun) a scientist who devotes himself to doing research | Synonyms: research worker, researcher |
| (noun) a police officer who investigates crimes | Synonyms: detective, police detective, tec |
| investigatory | (adjective) designed to find information or ascertain facts | Synonyms: fact-finding, investigative |
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| investing | (noun) the act of investing; laying out money or capital in an enterprise with the expectation of profit | Synonyms: investment |
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| investiture | (noun) the ceremonial act of clothing someone in the insignia of an office; the formal promotion of a person to an office or rank | Synonyms: investment |
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| (noun) the ceremony of installing a new monarch | Synonyms: coronation, enthronement, enthronisation, enthronization |
| investment | (noun) the act of investing; laying out money or capital in an enterprise with the expectation of profit | Synonyms: investing |
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| (noun) the act of putting on robes or vestments | - |
| (noun) the ceremonial act of clothing someone in the insignia of an office; the formal promotion of a person to an office or rank | Synonyms: investiture |
| (noun) outer layer or covering of an organ or part or organism | - |
| (noun) the commitment of something other than money (time, energy, or effort) to a project with the expectation of some worthwhile result | - |
| (noun) money that is invested with an expectation of profit | Synonyms: investment funds |
| investor | (noun) someone who commits capital in order to gain financial returns | - |
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| inveterate | (adjective) habitual | Synonyms: chronic |
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| (adverb) in a habitual and longstanding manner | Synonyms: chronically |