| invade | (verb) march aggressively into another's territory by military force for the purposes of conquest and occupation | Synonyms: occupy |
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| (verb) penetrate or assault, in a harmful or injurious way | - |
| (verb) to intrude upon, infringe, encroach on, violate | Synonyms: encroach upon, intrude on, obtrude upon |
| (verb) occupy in large numbers or live on a host | Synonyms: infest, overrun |
| invader | (noun) someone who enters by force in order to conquer | Synonyms: encroacher |
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| invading | (adjective) involving invasion or aggressive attack | Synonyms: incursive, invasive |
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| invaginate | (verb) fold inwards | Synonyms: introvert |
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| (verb) sheathe | - |
| 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 | (adjective) having no cogency or legal force | - |
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| (adjective) no longer valid | - |
| (noun) someone who is incapacitated by a chronic illness or injury | Synonyms: shut-in |
| (verb) injure permanently | Synonyms: disable, handicap, incapacitate |
| (verb) force to retire, remove from active duty, as of firemen | - |
| invalidate | (verb) take away the legal force of or render ineffective | Synonyms: vitiate, void |
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| (verb) show to be invalid | Synonyms: nullify |
| (verb) make invalid for use | Synonyms: cancel |
| (verb) declare invalid | Synonyms: annul, avoid, nullify, quash, void |
| invalidated | (adjective) deprived of legal force | Synonyms: nullified |
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| invalidating | (adjective) establishing as invalid or untrue | Synonyms: disconfirming |
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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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| invaluable | (adjective) having incalculable monetary, intellectual, or spiritual worth | Synonyms: priceless |
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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 | (adjective) not liable to or capable of change | - |
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| (noun) a quantity that does not vary | Synonyms: constant, constant quantity |
| invariableness | (noun) the quality of being resistant to variation | Synonyms: invariability, invariance |
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| invariably | (adverb) without variation or change, in every case | Synonyms: always, constantly |
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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 | (adjective) unvarying in nature | Synonyms: changeless, constant, unvarying |
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| (adjective) unaffected by a designated operation or transformation | - |
| (noun) a feature (quantity or property or function) that remains unchanged when a particular transformation is applied to it | - |
| 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 | - |
| invasive | (adjective) marked by a tendency to spread especially into healthy tissue | - |
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| (adjective) relating to a technique in which the body is entered by puncture or incision | - |
| (adjective) gradually intrusive without right or permission | Synonyms: encroaching, trespassing |
| (adjective) involving invasion or aggressive attack | Synonyms: incursive, invading |
| 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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| 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 |
| invidia | (noun) spite and resentment at seeing the success of another (personified as one of the deadly sins) | Synonyms: envy |
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| invidious | (adjective) containing or implying a slight or showing prejudice | Synonyms: discriminatory |
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| invidiously | (adverb) in a manner arousing resentment | - |
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| invigilate | (verb) watch over (students taking an exam, to prevent cheating) | Synonyms: proctor |
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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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| invigorate | (verb) impart vigor, strength, or vitality to | Synonyms: reinvigorate |
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| (verb) make lively | Synonyms: animate, enliven, liven, liven up |
| (verb) give life or energy to | Synonyms: quicken |
| (verb) heighten or intensify | Synonyms: animate, enliven, exalt, inspire |
| invigorated | (adjective) with restored energy | Synonyms: fresh, refreshed, reinvigorated |
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| invigorating | (adjective) imparting strength and vitality | - |
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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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| invincible | (adjective) incapable of being overcome or subdued | Synonyms: unbeatable, unvanquishable |
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| invincibly | (adverb) in an invincible manner | - |
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| inviolable | (adjective) incapable of being transgressed or dishonored | - |
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| (adjective) not capable of being violated or infringed | Synonyms: absolute, infrangible |
| (adjective) immune to attack; incapable of being tampered with | Synonyms: impregnable, secure, strong, unassailable, unattackable |
| (adjective) must be kept sacred | Synonyms: inviolate, sacrosanct |
| inviolate | (adjective) must be kept sacred | Synonyms: inviolable, sacrosanct |
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| (adjective) (of a woman) having the hymen unbroken | Synonyms: intact |
| invisibility | (noun) the quality of not being perceivable by the eye | Synonyms: invisibleness |
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| invisible | (adjective) impossible or nearly impossible to see; imperceptible by the eye | Synonyms: unseeable |
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| (adjective) not prominent or readily noticeable | Synonyms: inconspicuous |
| invisibleness | (noun) the quality of not being perceivable by the eye | Synonyms: invisibility |
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| invisibly | (adverb) without being seen | - |
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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 | - |
| invitational | (adjective) pertaining to or characteristic of an invitation | - |
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| invitatory | (adjective) conveying an invitation | - |
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| invite | (noun) a colloquial expression for invitation | - |
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| (verb) ask someone in a friendly way to do something | Synonyms: bid |
| (verb) request the participation or presence of | Synonyms: call for |
| (verb) ask to enter | Synonyms: ask in |
| (verb) express willingness to have in one's home or environs | Synonyms: receive, take in |
| (verb) give rise to a desire by being attractive or inviting | Synonyms: tempt |
| (verb) increase the likelihood of | Synonyms: ask for |
| (verb) invite someone to one's house | Synonyms: ask over, ask round |
| (verb) have as a guest | Synonyms: pay for |
| invitee | (noun) a visitor to whom hospitality is extended | Synonyms: guest |
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| inviting | (adjective) attractive and tempting | - |
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| invitingly | (adverb) in a tantalizing manner | Synonyms: tantalizingly |
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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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| (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 |
| 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 |
| invulnerable | (adjective) immune to attack; impregnable | - |
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