| filtrate | (noun) the product of filtration; a gas or liquid that has been passed through a filter | - |
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| filtration | (noun) the act of changing a fluid by passing it through a filter | - |
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| (noun) the process whereby fluids pass through a filter or a filtering medium | - |
| firebrat | (noun) lives in warm moist areas e.g. around furnaces | Synonyms: Thermobia domestica |
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| fitspiration | (noun) something that inspires you to exercise | - |
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| frat | (noun) a social club for male undergraduates | Synonyms: fraternity |
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| fraternisation | (noun) associating with others in a brotherly or friendly way; especially with an enemy | Synonyms: fraternization |
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| fraternity | (noun) people engaged in a particular occupation | Synonyms: brotherhood, sodality |
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| (noun) a social club for male undergraduates | Synonyms: frat |
| fraternization | (noun) associating with others in a brotherly or friendly way; especially with an enemy | Synonyms: fraternisation |
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| fratricide | (noun) the murder of your sibling | - |
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| (noun) fire that injures or kills an ally | Synonyms: friendly fire |
| (noun) a person who murders their brother or sister | - |
| frustration | (noun) an act of hindering someone's plans or efforts | Synonyms: foiling, thwarting |
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| (noun) the feeling that accompanies an experience of being thwarted in attaining your goals | Synonyms: defeat |
| (noun) a feeling of annoyance at being hindered or criticized | - |
| generation | (noun) the act of producing offspring or multiplying by such production | Synonyms: multiplication, propagation |
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| (noun) the production of heat or electricity | - |
| (noun) a coming into being | Synonyms: genesis |
| (noun) group of genetically related organisms constituting a single step in the line of descent | - |
| (noun) all the people living at the same time or of approximately the same age | Synonyms: coevals, contemporaries |
| (noun) the normal time between successive generations | - |
| (noun) a stage of technological development or innovation | - |
| generator | (noun) engine that converts mechanical energy into electrical energy by electromagnetic induction | - |
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| (noun) an apparatus that produces a vapor or gas | - |
| (noun) an electronic device for producing a signal voltage | - |
| (noun) someone who originates or causes or initiates something | Synonyms: author, source |
| geostrategy | (noun) the branch of geopolitics dealing with strategy | - |
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| grate | (noun) a frame of iron bars to hold a fire | Synonyms: grating |
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| (noun) a barrier that has parallel or crossed bars blocking a passage but admitting air | Synonyms: grating |
| (noun) a harsh rasping sound made by scraping something | - |
| gratefulness | (noun) warm friendly feelings of gratitude | Synonyms: appreciativeness, thankfulness |
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| grater | (noun) utensil with sharp perforations for shredding foods (as vegetables or cheese) | - |
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| graticule | (noun) a network of fine lines, dots, cross hairs, or wires in the focal plane of the eyepiece of an optical instrument | Synonyms: reticle, reticule |
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| gratification | (noun) the act or an instance of satisfying | - |
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| (noun) state of being gratified or satisfied | Synonyms: satisfaction |
| grating | (noun) a barrier that has parallel or crossed bars blocking a passage but admitting air | Synonyms: grate |
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| (noun) a frame of iron bars to hold a fire | Synonyms: grate |
| (noun) optical device consisting of a surface with many parallel grooves in it; disperses a beam of light (or other electromagnetic radiation) into its wavelengths to produce its spectrum | Synonyms: diffraction grating |
| gratitude | (noun) a feeling of thankfulness and appreciation | - |
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| gratuity | (noun) a relatively small amount of money given for services rendered (as by a waiter) | Synonyms: backsheesh, baksheesh, bakshis, bakshish, pourboire, tip |
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| (noun) an award (as for meritorious service) given without claim or obligation | - |
| gyration | (noun) the act of rotating in a circle or spiral | Synonyms: whirling |
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| (noun) a single complete turn (axial or orbital) | Synonyms: revolution, rotation |
| hieratic | (noun) a cursive form of Egyptian hieroglyphics; used especially by the priests | Synonyms: hieratic script |
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| hydrate | (noun) any compound that contains water of crystallization | - |
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| hydration | (noun) the process of combining with water; usually reversible | - |
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| hyperparathyroidism | (noun) excessive secretion of parathyroid hormone resulting in abnormally high levels of calcium in the blood; can affect many systems of the body (especially causing bone resorption and osteoporosis) | - |
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| hypoparathyroidism | (noun) inadequate secretion of parathyroid hormone resulting in abnormally low levels of calcium in the blood | - |
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| illiterate | (noun) a person unable to read | Synonyms: illiterate person, nonreader |
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| illustration | (noun) a visual representation (a picture or diagram) that is used to make some subject more pleasing or easier to understand | - |
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| (noun) an item of information that is typical of a class or group | Synonyms: example, instance, representative |
| (noun) artwork that helps make something clear or attractive | - |
| (noun) showing by example | Synonyms: exemplification |
| illustrator | (noun) an artist who makes illustrations (for books or magazines or advertisements etc.) | - |
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| immigration | (noun) migration into a place (especially migration to a country of which you are not a native in order to settle there) | Synonyms: in-migration |
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| (noun) the body of immigrants arriving during a specified interval | - |
| immoderateness | (noun) the quality of being excessive and lacking in moderation | Synonyms: immoderation |
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| immoderation | (noun) the quality of being excessive and lacking in moderation | Synonyms: immoderateness |
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| imperative | (noun) some duty that is essential and urgent | - |
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| (noun) a verb in the imperative mood. | Synonyms: imperative verb |
| (noun) a mood that expresses an intention to influence the listener's behavior | Synonyms: imperative form, imperative mood, jussive mood |
| imperativeness | (noun) the quality of being insistent | Synonyms: instancy |
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| (noun) the state of demanding notice or attention | Synonyms: insistence, insistency, press, pressure |
| inamorata | (noun) a woman with whom you are in love or have an intimate relationship | - |
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| inamorato | (noun) a man with whom you are in love or have an intimate relationship | - |
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| inauguration | (noun) the ceremonial induction into a position | Synonyms: inaugural |
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| (noun) the act of starting a new operation or practice | Synonyms: startup |
| incarceration | (noun) the state of being imprisoned | Synonyms: captivity, immurement, imprisonment |
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| incineration | (noun) the act of burning something completely; reducing it to ashes | - |
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| incinerator | (noun) a furnace for incinerating (especially to dispose of refuse) | - |
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| inconsiderateness | (noun) the quality of failing to be considerate of others | Synonyms: inconsideration, thoughtlessness |
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| inconsideration | (noun) the quality of failing to be considerate of others | Synonyms: inconsiderateness, thoughtlessness |
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| incorporation | (noun) including by incorporating | - |
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| (noun) consolidating two or more things; union in (or into) one body | - |
| (noun) learning (of values or attitudes etc.) that is incorporated within yourself | Synonyms: internalisation, internalization |
| induration | (noun) any pathological hardening or thickening of tissue | Synonyms: sclerosis |
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| 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 | - |
| 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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| inspectorate | (noun) a body of inspectors | - |
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| inspiration | (noun) the act of inhaling; the drawing in of air (or other gases) as in breathing | Synonyms: aspiration, breathing in, inhalation, intake |
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| (noun) arousing to a particular emotion or action | Synonyms: stirring |
| (noun) a product of your creative thinking and work | Synonyms: brainchild |
| (noun) (theology) a special influence of a divinity on the minds of human beings | Synonyms: divine guidance |
| (noun) a sudden intuition as part of solving a problem | - |
| (noun) arousal of the mind to special unusual activity or creativity | - |
| instauration | (noun) the act of starting something for the first time; introducing something new | Synonyms: creation, foundation, founding, initiation, innovation, institution, introduction, origination |
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| integrating | (noun) the action of incorporating a racial or religious group into a community | Synonyms: desegregation, integration |
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| integration | (noun) the action of incorporating a racial or religious group into a community | Synonyms: desegregation, integrating |
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| (noun) the act of combining into an integral whole | Synonyms: consolidation |
| (noun) an operation used in the calculus whereby the integral of a function is determined | - |
| integrator | (noun) a measuring instrument for measuring the area of an irregular plane figure | Synonyms: planimeter |
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| intemperateness | (noun) excess in action and immoderate indulgence of bodily appetites, especially in passion or indulgence | Synonyms: intemperance, self-indulgence |
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| (noun) consumption of alcoholic drinks | Synonyms: intemperance |
| interpenetration | (noun) mutual penetration; diffusion of each through the other | Synonyms: permeation |
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| (noun) the action of penetrating between or among | - |
| invertebrate | (noun) any animal lacking a backbone or notochord; the term is not used as a scientific classification | - |
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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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| iridokeratitis | (noun) inflammation of the iris and cornea of the eye | - |
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| irrational | (noun) a real number that cannot be expressed as a rational number | Synonyms: irrational number |
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| irrationality | (noun) the state of being irrational; lacking powers of understanding | Synonyms: unreason |
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| iteration | (noun) doing or saying again; a repeated performance | - |
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| (noun) (computer science) executing the same set of instructions a given number of times or until a specified result is obtained | Synonyms: looping |
| (noun) (computer science) a single execution of a set of instructions that are to be repeated | Synonyms: loop |
| iterative | (noun) the aspect of the verb that expresses the repetition of an action | Synonyms: iterative aspect |
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| itineration | (noun) journeying from place to place preaching or lecturing; a preaching tour or lecturing tour | - |
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| karat | (noun) the unit of measurement for the proportion of gold in an alloy; 18-karat gold is 75% gold; 24-karat gold is pure gold | Synonyms: carat, kt |
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| karate | (noun) a traditional Japanese system of unarmed combat; sharp blows and kicks are given to pressure-sensitive points on the body of the opponent | - |
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| keratalgia | (noun) pain in the cornea | - |
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| keratectasia | (noun) abnormal bulging of the cornea of the eye | - |
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| keratin | (noun) a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves | Synonyms: ceratin |
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| keratinisation | (noun) organic process by which keratin is deposited in cells and the cells become horny (as in nails and hair) | Synonyms: keratinization |
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| keratinization | (noun) organic process by which keratin is deposited in cells and the cells become horny (as in nails and hair) | Synonyms: keratinisation |
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| keratitis | (noun) inflammation of the cornea causing watery painful eyes and blurred vision | - |
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| keratoacanthoma | (noun) skin tumor that grows rapidly (especially in older people) and resembles a carcinoma but does not spread; it usually disappears spontaneously, often leaving a scar | - |
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| keratocele | (noun) hernia of the cornea | - |
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| keratoconjunctivitis | (noun) inflammation of the cornea and conjunctiva | - |
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| keratoconus | (noun) abnormal cone-shaped protrusion of the cornea of the eye; can be treated by epikeratophakia | - |
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| keratoderma | (noun) any skin disorder consisting of a growth that appears horny | Synonyms: keratodermia |
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| keratodermia | (noun) any skin disorder consisting of a growth that appears horny | Synonyms: keratoderma |
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| keratohyalin | (noun) hyaline in the large granules of the stratum granulosum | - |
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| keratoiritis | (noun) inflammation of the cornea and the iris of the eye | - |
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| keratomalacia | (noun) softening and drying and ulceration of the cornea resulting from vitamin A deficiency; symptom of cystic fibrosis or sprue | - |
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| keratomycosis | (noun) fungal infection of the cornea | - |
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| keratonosis | (noun) any abnormal condition of the outer skin (epidermis) | - |
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| keratonosus | (noun) any disease of the cornea | - |
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| keratoplasty | (noun) a surgical procedure in which part or all of a damaged or diseased cornea is replaced by healthy corneal tissue from a donor | Synonyms: corneal graft, corneal transplant |
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| keratoscleritis | (noun) inflammation of the cornea and sclera of the eye | - |
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| keratoscope | (noun) medical instrument to examine the cornea in order to detect irregularities in its anterior surface | - |
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| keratoscopy | (noun) examination of the cornea with a keratoscope to detect irregularities in its anterior surface | - |
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| keratosis | (noun) a skin condition marked by an overgrowth of layers of horny skin | - |
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| keratotomy | (noun) surgical incision into the cornea | - |
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| kurrat | (noun) coarse Old World perennial having a large bulb and tall stalk of greenish purple-tinged flowers; widely naturalized | Synonyms: Allium ampeloprasum, Levant garlic, wild leek |
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| laboratory | (noun) a workplace for the conduct of scientific research | Synonyms: lab, research lab, research laboratory, science lab, science laboratory |
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| (noun) a region resembling a laboratory inasmuch as it offers opportunities for observation and practice and experimentation | Synonyms: testing ground |
| laceration | (noun) the act of lacerating | - |
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| (noun) a torn ragged wound | - |
| levirate | (noun) the biblical institution whereby a man must marry the widow of his childless brother in order to maintain the brother's line | - |
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| liberation | (noun) the attempt to achieve equal rights or status | - |
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| (noun) the termination of someone's employment (leaving them free to depart) | Synonyms: discharge, dismissal, dismission, firing, release, sack, sacking |
| (noun) the act of liberating someone or something | Synonyms: freeing, release |
| liberator | (noun) someone who releases people from captivity or bondage | - |
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| libration | (noun) (astronomy) a real or apparent slow oscillation of a moon or satellite | - |
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