| 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. | - |
| 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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| 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 |
| 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 | - |
| inventorying | (noun) making an itemized list of merchandise or supplies on hand | Synonyms: inventory, stock-taking, stocktaking |
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| inverse | (noun) something inverted in sequence or character or effect | Synonyms: opposite |
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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) | - |
| invertase | (noun) an enzyme that catalyzes the hydrolysis of sucrose into glucose and fructose | Synonyms: saccharase, sucrase |
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| invertebrate | (noun) any animal lacking a backbone or notochord; the term is not used as a scientific classification | - |
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| inverter | (noun) an electrical converter that converts direct current into alternating current | - |
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| 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 |
| 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 |
| 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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| invidia | (noun) spite and resentment at seeing the success of another (personified as one of the deadly sins) | Synonyms: envy |
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| invigilation | (noun) keeping watch over examination candidates to prevent cheating | - |
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| invigilator | (noun) someone who watches examination candidates to prevent cheating | - |
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| invigoration | (noun) the activity of giving vitality and vigour to something | Synonyms: animation, vivification |
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| (noun) quality of being active or spirited or alive and vigorous | Synonyms: animation, brio, spiritedness, vivification |
| invigorator | (noun) an agent that gives or restores life or vigor | Synonyms: enlivener, quickener |
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| invincibility | (noun) the property being difficult or impossible to defeat | Synonyms: indomitability |
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| invisibility | (noun) the quality of not being perceivable by the eye | Synonyms: invisibleness |
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| invisibleness | (noun) the quality of not being perceivable by the eye | Synonyms: invisibility |
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| invitation | (noun) a tempting allurement | - |
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| (noun) a request (spoken or written) to participate or be present or take part in something | - |
| invite | (noun) a colloquial expression for invitation | - |
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| invitee | (noun) a visitor to whom hospitality is extended | Synonyms: guest |
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| 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 |
| invulnerability | (noun) the property of being invulnerable; the property of being incapable of being hurt (physically or emotionally) | - |
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| (noun) having the strength to withstand attack | Synonyms: impregnability |