| infantry | (noun) an army unit consisting of soldiers who fight on foot | Synonyms: foot |
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| infantryman | (noun) fights on foot with small arms | Synonyms: foot soldier, footslogger, marcher |
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| infarct | (noun) localized necrosis resulting from obstruction of the blood supply | Synonyms: infarction |
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| infarction | (noun) localized necrosis resulting from obstruction of the blood supply | Synonyms: infarct |
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| infatuation | (noun) an object of extravagant short-lived passion | - |
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| (noun) a foolish and usually extravagant passion or love or admiration | - |
| (noun) temporary love of an adolescent | Synonyms: calf love, crush, puppy love |
| infeasibility | (noun) the quality of not being doable | Synonyms: unfeasibility |
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| infection | (noun) moral corruption or contamination | - |
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| (noun) (international law) illegality that taints or contaminates a ship or cargo rendering it liable to seizure | - |
| (noun) the communication of an attitude or emotional state among a number of people | Synonyms: contagion |
| (noun) an incident in which an infectious disease is transmitted | Synonyms: contagion, transmission |
| (noun) (medicine) the invasion of the body by pathogenic microorganisms and their multiplication which can lead to tissue damage and disease | - |
| (noun) (phonetics) the alteration of a speech sound under the influence of a neighboring sound | - |
| (noun) the pathological state resulting from the invasion of the body by pathogenic microorganisms | - |
| infelicity | (noun) inappropriate and unpleasing manner or style (especially manner or style of expression) | - |
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| inference | (noun) the reasoning involved in drawing a conclusion or making a logical judgment on the basis of circumstantial evidence and prior conclusions rather than on the basis of direct observation | Synonyms: illation |
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| inferior | (noun) a character or symbol set or printed or written beneath or slightly below and to the side of another character | Synonyms: subscript |
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| (noun) one of lesser rank or station or quality | - |
| inferiority | (noun) an inferior quality | Synonyms: low quality |
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| (noun) the quality of being a competitive disadvantage | Synonyms: unfavorable position |
| (noun) the state of being inferior | Synonyms: lower rank, lower status |
| infernal | (noun) an inhabitant of Hell | - |
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| inferno | (noun) a very intense and uncontrolled fire | Synonyms: conflagration |
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| (noun) any place of pain and turmoil | Synonyms: hell, hell on earth, hellhole, snake pit, the pits |
| infertility | (noun) the state of being unable to produce offspring; in a woman it is an inability to conceive; in a man it is an inability to impregnate | Synonyms: sterility |
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| infestation | (noun) a swarm of insects that attack plants | Synonyms: plague |
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| (noun) the state of being invaded or overrun by parasites | - |
| infidel | (noun) a person who does not acknowledge your god | Synonyms: gentile, heathen, pagan |
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| infidelity | (noun) the quality of being unfaithful | Synonyms: unfaithfulness |
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| infield | (noun) the area of a baseball field that is enclosed by 3 bases and home plate | Synonyms: baseball diamond, diamond |
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| infielder | (noun) (baseball) a person who plays a position in the infield | - |
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| infighting | (noun) boxing at close quarters | - |
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| (noun) conflict between members of the same organization (usually concealed from outsiders) | - |
| infiltration | (noun) a process in which individuals (or small groups) penetrate an area (especially the military penetration of enemy positions without detection) | - |
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| (noun) the slow passage of a liquid through a filtering medium | Synonyms: percolation |
| infiltrator | (noun) an intruder (as troops) with hostile intent | - |
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| (noun) someone who takes up a position surreptitiously for the purpose of espionage | - |
| infinite | (noun) the unlimited expanse in which everything is located | Synonyms: space |
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| infiniteness | (noun) the quality of being infinite; without bound or limit | Synonyms: boundlessness, infinitude, limitlessness, unboundedness |
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| infinitesimal | (noun) (mathematics) a variable that has zero as its limit | - |
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| infinitive | (noun) the uninflected form of the verb | - |
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| infinitude | (noun) the quality of being infinite; without bound or limit | Synonyms: boundlessness, infiniteness, limitlessness, unboundedness |
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| (noun) an infinite quantity | - |
| infinity | (noun) time without end | Synonyms: eternity |
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| infirmary | (noun) a health facility where patients receive treatment | Synonyms: hospital |
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| infirmity | (noun) the state of being weak in health or body (especially from old age) | Synonyms: debility, feebleness, frailness, frailty, valetudinarianism |
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| infix | (noun) an affix that is inserted inside the word | - |
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| inflaming | (noun) arousal to violent emotion | Synonyms: inflammation |
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| inflammability | (noun) the quality of being easily ignited and burning rapidly | Synonyms: flammability |
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| inflammation | (noun) arousal to violent emotion | Synonyms: inflaming |
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| (noun) the act of setting something on fire | Synonyms: firing, ignition, kindling, lighting |
| (noun) a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat | Synonyms: redness, rubor |
| (noun) the state of being emotionally aroused and worked up | Synonyms: excitation, excitement, fervor, fervour |
| inflater | (noun) an air pump operated by hand to inflate something (as a tire) | Synonyms: inflator |
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| inflation | (noun) the act of filling something with air | - |
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| (noun) lack of elegance as a consequence of being pompous and puffed up with vanity | Synonyms: ostentation, ostentatiousness, pomposity, pompousness, pretentiousness, puffiness, splashiness |
| (noun) (cosmology) a brief exponential expansion of the universe (faster than the speed of light) postulated to have occurred shortly after the big bang | - |
| (noun) a general and progressive increase in prices | Synonyms: rising prices |
| inflator | (noun) an air pump operated by hand to inflate something (as a tire) | Synonyms: inflater |
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| inflection | (noun) the patterns of stress and intonation in a language | Synonyms: prosody |
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| (noun) a manner of speaking in which the loudness or pitch or tone of the voice is modified | Synonyms: modulation |
| (noun) deviation from a straight or normal course | Synonyms: flection, flexion |
| (noun) a change in the form of a word (usually by adding a suffix) to indicate a change in its grammatical function | Synonyms: inflexion |
| inflexibility | (noun) the quality of being rigid and rigorously severe | Synonyms: rigidity, rigidness |
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| (noun) a lack of physical flexibility | Synonyms: inflexibleness |
| inflexibleness | (noun) a lack of physical flexibility | Synonyms: inflexibility |
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| inflexion | (noun) a change in the form of a word (usually by adding a suffix) to indicate a change in its grammatical function | Synonyms: inflection |
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| infliction | (noun) the act of imposing something (as a tax or an embargo) | Synonyms: imposition |
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| (noun) an act causing pain or damage | - |
| (noun) something or someone that causes trouble; a source of unhappiness | Synonyms: annoyance, bother, botheration, nuisance, pain, pain in the ass, pain in the neck |
| infliximab | (noun) an anti-TNF compound (trade name Remicade) consisting of an antibody directed against TNF; it is given intravenously at one-month to three-month intervals; used in treatment of regional enteritis and rheumatoid arthritis | Synonyms: Remicade |
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| (noun) a monoclonal antibody (trade name Remicade) used to treat Crohn's disease and rheumatoid arthritis; administered by infusion; use and dosage must be determined by a physician | Synonyms: Remicade |
| inflorescence | (noun) the flowering part of a plant or arrangement of flowers on a stalk | - |
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| (noun) the time and process of budding and unfolding of blossoms | Synonyms: anthesis, blossoming, efflorescence, florescence, flowering |
| inflow | (noun) the process of flowing in | Synonyms: influx |
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| influence | (noun) causing something without any direct or apparent effort | - |
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| (noun) a power to affect persons or events especially power based on prestige etc | - |
| (noun) a cognitive factor that tends to have an effect on what you do | - |
| (noun) one having power to influence another | - |
| (noun) the effect of one thing (or person) on another | - |
| influencer | (noun) a person who has a large following on one or more social media platform that works to generate interest in contemporary social issues and/or advertise consumer products | - |
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| influenza | (noun) an acute febrile highly contagious viral disease | Synonyms: flu, grippe |
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| influx | (noun) the process of flowing in | Synonyms: inflow |
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| info | (noun) a message received and understood | Synonyms: information |
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| infolding | (noun) the folding in of an outer layer so as to form a pocket in the surface | Synonyms: introversion, intussusception, invagination |
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| infomercial | (noun) a television commercial presented in the form of a short documentary | Synonyms: informercial |
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| informality | (noun) a manner that does not take forms and ceremonies seriously | - |
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| (noun) freedom from constraint or embarrassment | Synonyms: ease |
| informant | (noun) a person who supplies information | Synonyms: source |
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| (noun) someone who sees an event and reports what happened | Synonyms: witness, witnesser |
| informatics | (noun) the sciences concerned with gathering, manipulating, storing, retrieving, and classifying recorded information | Synonyms: information processing, information science, IP |
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| information | (noun) (communication theory) a numerical measure of the uncertainty of an outcome | Synonyms: entropy, selective information |
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| (noun) knowledge acquired through study or experience or instruction | - |
| (noun) a message received and understood | Synonyms: info |
| (noun) formal accusation of a crime | - |
| (noun) a collection of facts from which conclusions may be drawn | Synonyms: data |
| informer | (noun) one who reveals confidential information to the police or other authority | Synonyms: betrayer, blabber, rat, squealer |
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| informercial | (noun) a television commercial presented in the form of a short documentary | Synonyms: infomercial |
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| informing | (noun) a speech act that conveys information | Synonyms: making known |
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| (noun) to furnish incriminating evidence to an officer of the law (usually in return for favors) | Synonyms: ratting |
| infotainment | (noun) a film or TV program presenting the facts about a person or event | Synonyms: docudrama, documentary, documentary film |
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| infraction | (noun) a crime less serious than a felony | Synonyms: infringement, misdemeanor, misdemeanour, violation |
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| infrared | (noun) the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range | Synonyms: infrared frequency |
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| (noun) electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves | Synonyms: infrared emission, infrared light, infrared radiation |
| infrastructure | (noun) the stock of basic facilities and capital equipment needed for the functioning of a country or area | Synonyms: base |
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| (noun) the basic structure or features of a system or organization | Synonyms: substructure |
| infrequency | (noun) noteworthy scarcity | Synonyms: rareness, rarity |
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| infrigidation | (noun) the process of cooling or freezing (e.g., food) for preservative purposes | Synonyms: refrigeration |
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| infringement | (noun) a crime less serious than a felony | Synonyms: infraction, misdemeanor, misdemeanour, violation |
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| (noun) an act that disregards an agreement or a right | Synonyms: violation |
| infructescence | (noun) the fruiting stage of the inflorescence | - |
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| infundibulum | (noun) any of various funnel-shaped parts of the body (but especially the hypophyseal stalk) | - |
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| infuriation | (noun) a feeling of intense anger and impatience | Synonyms: enragement |
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| infusion | (noun) (medicine) the passive introduction of a substance (a fluid or drug or electrolyte) into a vein or between tissues (as by gravitational force) | - |
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| (noun) the act of infusing or introducing a certain modifying element or quality | - |
| (noun) the process of extracting certain active properties (as a drug from a plant) by steeping or soaking (usually in water) | - |
| (noun) a solution obtained by steeping or soaking a substance (usually in water) | Synonyms: extract |
| infusorian | (noun) any member of the subclass Infusoria | - |
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| inga | (noun) any tree or shrub of the genus Inga having pinnate leaves and showy usually white flowers; cultivated as ornamentals | - |
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| ingathering | (noun) request for a sum of money | Synonyms: appeal, collection, solicitation |
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| ingeniousness | (noun) the property of being ingenious | Synonyms: cleverness, ingenuity |
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| (noun) the power of creative imagination | Synonyms: cleverness, ingenuity, inventiveness |
| ingenue | (noun) the role of an innocent artless young woman in a play | - |
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| (noun) an artless innocent young girl (especially as portrayed on the stage) | - |
| (noun) an actress who specializes in playing the role of an artless innocent young girl | - |
| ingenuity | (noun) the property of being ingenious | Synonyms: cleverness, ingeniousness |
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| (noun) the power of creative imagination | Synonyms: cleverness, ingeniousness, inventiveness |
| ingenuousness | (noun) openly straightforward or frank | - |
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| (noun) the quality of innocent naivete | Synonyms: artlessness, innocence, naturalness |
| ingesta | (noun) solid and liquid nourishment taken into the body through the mouth | - |
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| ingestion | (noun) the process of taking food into the body through the mouth (as by eating) | Synonyms: consumption, intake, uptake |
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| inglenook | (noun) a corner by a fireplace | Synonyms: chimney corner |
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| ingot | (noun) metal that is cast in the shape of a block for convenient handling | - |
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| ingraining | (noun) teaching or impressing upon the mind by frequent instruction or repetition | Synonyms: inculcation, instilling |
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| ingrate | (noun) a person who shows no gratitude | Synonyms: thankless wretch, ungrateful person |
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| ingratiation | (noun) the act of gaining acceptance or affection for yourself by persuasive and subtle blandishments | Synonyms: insinuation |
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| ingratitude | (noun) a lack of gratitude | Synonyms: ungratefulness |
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| ingredient | (noun) a component of a mixture or compound | - |
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| (noun) an abstract part of something | Synonyms: component, constituent, element, factor |
| (noun) food that is a component of a mixture in cooking | Synonyms: fixings |
| ingress | (noun) the act of entering | Synonyms: entering, entrance, entry, incoming |
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| (noun) (astronomy) the disappearance of a celestial body prior to an eclipse | Synonyms: immersion |
| ingressive | (noun) a speech sound by which the airstream flows inward through the mouth or nose. | - |
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| ingroup | (noun) an exclusive circle of people with a common purpose | Synonyms: camp, clique, coterie, inner circle, pack |
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| ingrowth | (noun) something that grows inward | - |
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| inguen | (noun) the crease at the junction of the inner part of the thigh with the trunk together with the adjacent region and often including the external genitals | Synonyms: groin |
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| inhabitancy | (noun) the act of dwelling in or living permanently in a place (said of both animals and men) | Synonyms: habitation, inhabitation |
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| inhabitant | (noun) a person who inhabits a particular place | Synonyms: denizen, dweller, habitant, indweller |
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| inhabitation | (noun) the act of dwelling in or living permanently in a place (said of both animals and men) | Synonyms: habitation, inhabitancy |
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| inhalant | (noun) a medication to be taken by inhaling it | Synonyms: inhalation |
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| (noun) something that is inhaled | - |
| inhalation | (noun) the act of inhaling; the drawing in of air (or other gases) as in breathing | Synonyms: aspiration, breathing in, inspiration, intake |
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| (noun) a medication to be taken by inhaling it | Synonyms: inhalant |
| inhalator | (noun) a dispenser that produces a chemical vapor to be inhaled in order to relieve nasal congestion | Synonyms: inhaler |
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| (noun) a breathing device for administering long-term artificial respiration | Synonyms: respirator |
| inhaler | (noun) a dispenser that produces a chemical vapor to be inhaled in order to relieve nasal congestion | Synonyms: inhalator |
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| inharmoniousness | (noun) a lack of harmony | Synonyms: disharmony |
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| inherence | (noun) the state of inhering; the state of being a fixed characteristic | Synonyms: inherency |
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