| dyestuff | (noun) a usually soluble substance for staining or coloring e.g. fabrics or hair | Synonyms: dye |
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| dysfunction | (noun) (medicine) any disturbance in the functioning of an organ or body part or a disturbance in the functioning of a social group | Synonyms: disfunction |
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| dysfunctionality | (noun) The condition of functioning incorrectly or abnormally. | - |
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| earcuff | (noun) a non-pierced earring of varying size (i.e. small wrap or hook big enough to hang over the whole ear and dangle) worn on the rim of the ear. | Synonyms: ear cuff, ear hook earring, ear wrap |
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| earflap | (noun) one of two flaps attached to a cap to keep the ears warm | Synonyms: earlap |
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| earful | (noun) a severe scolding | Synonyms: bawling out, castigation, chewing out, dressing down, going-over, upbraiding |
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| (noun) an outpouring of gossip | - |
| earmuff | (noun) either of a pair of ear coverings (usually connected by a headband) that are worn to keep the ears warm in cold weather | - |
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| edification | (noun) uplifting enlightenment | Synonyms: sophistication |
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| edifice | (noun) a structure that has a roof and walls and stands more or less permanently in one place | Synonyms: building |
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| effacement | (noun) withdrawing into the background; making yourself inconspicuous | Synonyms: self-effacement |
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| (noun) shortening of the uterine cervix and thinning of its walls as it is dilated during labor | - |
| effect | (noun) an outward appearance | Synonyms: impression |
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| (noun) (of a law) having legal validity | Synonyms: force |
| (noun) an impression (especially one that is artificial or contrived) | - |
| (noun) the central meaning or theme of a speech or literary work | Synonyms: burden, core, essence, gist |
| (noun) a phenomenon that follows and is caused by some previous phenomenon | Synonyms: consequence, event, issue, outcome, result, upshot |
| (noun) a symptom caused by an illness or a drug | - |
| effecter | (noun) one who brings about a result or event; one who accomplishes a purpose | Synonyms: effector |
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| effectiveness | (noun) power to be effective; the quality of being able to bring about an effect | Synonyms: effectivity, effectuality, effectualness |
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| (noun) capacity to produce strong physiological or chemical effects | Synonyms: potency, strength |
| effectivity | (noun) power to be effective; the quality of being able to bring about an effect | Synonyms: effectiveness, effectuality, effectualness |
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| effector | (noun) an organ (a gland or muscle) that becomes active in response to nerve impulses | - |
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| (noun) a nerve fiber that terminates on a muscle or gland and stimulates contraction or secretion | - |
| (noun) one who brings about a result or event; one who accomplishes a purpose | Synonyms: effecter |
| effects | (noun) property of a personal character that is portable but not used in business | Synonyms: personal effects |
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| effectuality | (noun) power to be effective; the quality of being able to bring about an effect | Synonyms: effectiveness, effectivity, effectualness |
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| effectualness | (noun) power to be effective; the quality of being able to bring about an effect | Synonyms: effectiveness, effectivity, effectuality |
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| effectuation | (noun) the act of implementing (providing a practical means for accomplishing something); carrying into effect | Synonyms: implementation |
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| effeminacy | (noun) the trait of being effeminate (derogatory of a man) | Synonyms: effeminateness, sissiness, softness, unmanliness, womanishness |
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| effeminateness | (noun) the trait of being effeminate (derogatory of a man) | Synonyms: effeminacy, sissiness, softness, unmanliness, womanishness |
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| effendi | (noun) a former Turkish term of respect; especially for government officials | - |
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| efferent | (noun) a nerve that conveys impulses toward or to muscles or glands | Synonyms: efferent nerve, motor nerve |
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| effervescence | (noun) the property of giving off bubbles | Synonyms: bubbliness, frothiness |
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| (noun) the process of bubbling as gas escapes | - |
| efficaciousness | (noun) capacity or power to produce a desired effect | Synonyms: efficacy |
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| efficacy | (noun) capacity or power to produce a desired effect | Synonyms: efficaciousness |
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| efficiency | (noun) skillfulness in avoiding wasted time and effort | - |
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| (noun) the ratio of the output to the input of any system | - |
| effigy | (noun) a representation of a person (especially in the form of sculpture) | Synonyms: image, simulacrum |
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| effleurage | (noun) a rhythmic stroking | - |
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| efflorescence | (noun) a powdery deposit on a surface | Synonyms: bloom |
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| (noun) the time and process of budding and unfolding of blossoms | Synonyms: anthesis, blossoming, florescence, flowering, inflorescence |
| (noun) any red eruption of the skin | Synonyms: rash, roseola, skin rash |
| (noun) the period of greatest prosperity or productivity | Synonyms: bloom, blossom, flower, flush, heyday, peak, prime |
| effluence | (noun) the process of flowing out | Synonyms: efflux, outflow |
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| effluent | (noun) water mixed with waste matter | Synonyms: sewer water, wastewater |
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| effluvium | (noun) a foul-smelling outflow or vapor (especially a gaseous waste) | - |
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| efflux | (noun) the process of flowing out | Synonyms: effluence, outflow |
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| effort | (noun) earnest and conscientious activity intended to do or accomplish something | Synonyms: attempt, endeavor, endeavour, try |
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| (noun) use of physical or mental energy; hard work | Synonyms: elbow grease, exertion, sweat, travail |
| (noun) a notable achievement | Synonyms: exploit, feat |
| (noun) a series of actions advancing a principle or tending toward a particular end | Synonyms: campaign, cause, crusade, drive, movement |
| effortfulness | (noun) the quality of requiring deliberate effort | - |
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| effortlessness | (noun) the quality of requiring little effort | - |
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| effrontery | (noun) audacious (even arrogant) behavior that you have no right to | Synonyms: assumption, presumption, presumptuousness |
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| effulgence | (noun) the quality of being bright and sending out rays of light | Synonyms: radiance, radiancy, refulgence, refulgency, shine |
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| effusion | (noun) flow under pressure | - |
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| (noun) an unrestrained expression of emotion | Synonyms: blowup, ebullition, gush, outburst |
| effusiveness | (noun) a friendly open trait of a talkative person | Synonyms: expansiveness, expansivity |
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| eft | (noun) a newt in its terrestrial stage of development | - |
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| eggfruit | (noun) ovoid orange-yellow mealy sweet fruit of Florida and West Indies | Synonyms: canistel |
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| eisteddfod | (noun) any of several annual Welsh festivals involving artistic competitions (especially in singing) | - |
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| electrification | (noun) the activity of thrilling or markedly exciting some person or group | - |
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| (noun) the act of providing electricity | - |
| elf | (noun) (folklore) fairies that are somewhat mischievous | Synonyms: brownie, gremlin, hob, imp, pixie, pixy |
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| emf | (noun) the rate at which energy is drawn from a source that produces a flow of electricity in a circuit; expressed in volts | Synonyms: electromotive force, voltage |
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| emulsifier | (noun) a surface-active agent that promotes the formation of an emulsion | - |
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| enfeeblement | (noun) serious weakening and loss of energy | Synonyms: debilitation, enervation, exhaustion |
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| enfeoffment | (noun) under the feudal system, the deed by which a person was given land in exchange for a pledge of service | - |
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| enfilade | (noun) gunfire directed along the length rather than the breadth of a formation | Synonyms: enfilade fire |
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| enflurane | (noun) a nonflammable liquid (trade name Ethrane) used as an inhalation general anesthetic | Synonyms: Ethrane |
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| enfolding | (noun) the action of enfolding something | Synonyms: involution |
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| enforcement | (noun) the act of enforcing; ensuring observance of or obedience to | - |
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| enforcer | (noun) one whose job it is to execute unpleasant tasks for a superior | Synonyms: hatchet man |
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| enfranchisement | (noun) the act of certifying or bestowing a franchise on | Synonyms: certification |
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| (noun) a statutory right or privilege granted to a person or group by a government (especially the rights of citizenship and the right to vote) | Synonyms: franchise |
| (noun) freedom from political subjugation or servitude | - |
| ergocalciferol | (noun) a fat-soluble vitamin that prevents rickets | Synonyms: calciferol, cholecalciferol, D, viosterol, vitamin D |
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| evenfall | (noun) the time of day immediately following sunset | Synonyms: crepuscle, crepuscule, dusk, fall, gloam, gloaming, nightfall, twilight |
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| exaflop | (noun) (computer science) a unit for measuring the speed of a computer system, equal to one quintillion floating-point operations a second. | Synonyms: EFLOPS |
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| exemplification | (noun) a representational or typifying form or model | Synonyms: typification |
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| (noun) showing by example | Synonyms: illustration |
| exfoliation | (noun) a thin flake of dead epidermis shed from the surface of the skin | Synonyms: scale, scurf |
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| (noun) the peeling off in flakes or scales of bark or dead skin | - |
| eyeful | (noun) a full view; a good look | - |
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| (noun) a strikingly beautiful woman | - |
| f | (noun) the 6th letter of the Roman alphabet | Synonyms: F |
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| fa | (noun) the syllable naming the fourth (subdominant) note of the diatonic scale in solmization | - |
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| fable | (noun) a short moral story (often with animal characters) | Synonyms: allegory, apologue, parable |
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| (noun) a story about mythical or supernatural beings or events | Synonyms: legend |
| (noun) a deliberately false or improbable account | Synonyms: fabrication, fiction |
| fabric | (noun) artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers | Synonyms: cloth, material, textile |
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| (noun) the underlying structure | Synonyms: framework |
| fabrication | (noun) the act of making something (a product) from raw materials | Synonyms: manufacture, manufacturing |
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| (noun) the act of constructing something (as a piece of machinery) | Synonyms: assembly |
| (noun) writing in a fictional form | Synonyms: fictionalisation, fictionalization |
| (noun) the deliberate act of deviating from the truth | Synonyms: lying, prevarication |
| (noun) a deliberately false or improbable account | Synonyms: fable, fiction |
| fabricator | (noun) someone who tells lies | Synonyms: fibber, storyteller |
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| fabulist | (noun) a person who tells or invents fables | - |
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| facade | (noun) the face or front of a building | Synonyms: frontage, frontal |
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| (noun) a showy misrepresentation intended to conceal something unpleasant | Synonyms: window dressing |
| face | (noun) a vertical surface of a building or cliff | - |
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| (noun) the side upon which the use of a thing depends (usually the most prominent surface of an object) | - |
| (noun) the striking or working surface of an implement | - |
| (noun) the general outward appearance of something | - |
| (noun) status in the eyes of others | - |
| (noun) impudent aggressiveness | Synonyms: boldness, brass, cheek, nerve |
| (noun) the feelings expressed on a person's face | Synonyms: aspect, expression, facial expression, look |
| (noun) the front of the human head from the forehead to the chin and ear to ear | Synonyms: human face |
| (noun) the part of an animal corresponding to the human face | - |
| (noun) a specific size and style of type within a type family | Synonyms: case, font, fount, typeface |
| (noun) a contorted facial expression | Synonyms: grimace |
| (noun) a surface forming part of the outside of an object | Synonyms: side |
| (noun) a part of a person that is used to refer to a person | - |
| facelift | (noun) plastic surgery to remove wrinkles and other signs of aging from your face; an incision is made near the hair line and skin is pulled back and excess tissue is excised | Synonyms: cosmetic surgery, face lift, face lifting, lift, nip and tuck, rhytidectomy, rhytidoplasty |
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| (noun) a renovation that improves the outward appearance (as of a building) but usually does not involve major changes | Synonyms: face lift, face lifting |
| facepalm | (noun) the act of putting your hand to cover your face to show disappointment or despair | - |
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| faceplate | (noun) a protective covering for the front of a machine or device (as a door lock or computer component) | - |
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| facer | (noun) (a dated Briticism) a serious difficulty with which one is suddenly faced | - |
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| facet | (noun) a distinct feature or element in a problem | Synonyms: aspect |
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| (noun) a smooth surface (as of a bone or cut gemstone) | - |
| facetiousness | (noun) playful humor | - |
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| facia | (noun) a sheet or band of fibrous connective tissue separating or binding together muscles and organs etc | Synonyms: fascia |
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| facial | (noun) care for the face that usually involves cleansing and massage and the application of cosmetic creams | - |
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| (noun) cranial nerve that supplies facial muscles | Synonyms: facial nerve, nervus facialis, seventh cranial nerve |
| facilitation | (noun) act of assisting or making easier the progress or improvement of something | - |
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| (noun) (neurophysiology) phenomenon that occurs when two or more neural impulses that alone are not enough to trigger a response in a neuron combine to trigger an action potential | - |
| (noun) the condition of being made easy (or easier) | - |
| facilitator | (noun) someone who makes progress easier | - |
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| facility | (noun) a service that an organization or a piece of equipment offers you | - |
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| (noun) something designed and created to serve a particular function and to afford a particular convenience or service | - |
| (noun) a building or place that provides a particular service or is used for a particular industry | Synonyms: installation |
| (noun) a natural effortlessness | Synonyms: readiness |
| (noun) skillful performance or ability without difficulty | Synonyms: adeptness, adroitness, deftness, quickness |
| facing | (noun) providing something with a surface of a different material | Synonyms: lining |
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| (noun) a protective covering that protects the outside of a building | Synonyms: cladding |
| (noun) a lining applied to the edge of a garment for ornamentation or strengthening | - |
| (noun) an ornamental coating to a building | Synonyms: veneer |
| facsimile | (noun) duplicator that transmits the copy by wire or radio | Synonyms: facsimile machine, fax |
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| (noun) an exact copy or reproduction | Synonyms: autotype |
| fact | (noun) a piece of information about circumstances that exist or events that have occurred | - |
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| (noun) a concept whose truth can be proved | - |
| (noun) a statement or assertion of verified information about something that is the case or has happened | - |
| (noun) an event known to have happened or something known to have existed | - |
| faction | (noun) a dissenting clique | Synonyms: sect |
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| (noun) a clique (often secret) that seeks power usually through intrigue | Synonyms: cabal, camarilla, junto |
| factoid | (noun) a brief (usually one sentence and usually trivial) news item | - |
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| (noun) something resembling a fact; unverified (often invented) information that is given credibility because it appeared in print | - |
| factor | (noun) (genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity | Synonyms: cistron, gene |
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| (noun) an abstract part of something | Synonyms: component, constituent, element, ingredient |
| (noun) an independent variable in statistics | - |
| (noun) anything that contributes causally to a result | - |
| (noun) a businessman who buys or sells for another in exchange for a commission | Synonyms: agent, broker |
| (noun) one of two or more integers that can be exactly divided into another integer | Synonyms: divisor |
| (noun) any of the numbers (or symbols) that form a product when multiplied together | - |
| factorial | (noun) the product of all the integers up to and including a given integer | - |
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| factoring | (noun) (mathematics) the resolution of an expression into factors such that when multiplied together they give the original expression | Synonyms: factorisation, factorization |
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| factorisation | (noun) (mathematics) the resolution of an expression into factors such that when multiplied together they give the original expression | Synonyms: factoring, factorization |
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| factorization | (noun) (mathematics) the resolution of an expression into factors such that when multiplied together they give the original expression | Synonyms: factoring, factorisation |
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| factory | (noun) a plant consisting of one or more buildings with facilities for manufacturing | Synonyms: manufactory, manufacturing plant, mill |
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| factotum | (noun) a servant employed to do a variety of jobs | - |
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| factuality | (noun) the quality of being actual or based on fact | Synonyms: factualness |
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| factualness | (noun) the quality of being actual or based on fact | Synonyms: factuality |
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| facula | (noun) a large bright spot on the sun's photosphere occurring most frequently in the vicinity of sunspots | Synonyms: solar facula |
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| (noun) a bright spot on a planet | - |
| faculty | (noun) one of the inherent cognitive or perceptual powers of the mind | Synonyms: mental faculty, module |
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| (noun) the body of teachers and administrators at a school | Synonyms: staff |
| fad | (noun) an interest followed with exaggerated zeal | Synonyms: craze, cult, furor, furore, rage |
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| faddist | (noun) a person who subscribes to a variety of fads | - |
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