| affirmativeness | (noun) the agreeable quality of one who assents | - |
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| afflatus | (noun) a strong creative impulse; divine inspiration | - |
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| afforest | (verb) establish a forest on previously unforested land | Synonyms: forest |
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| afforestation | (noun) the conversion of bare or cultivated land into forest (originally for the purpose of hunting) | - |
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| affranchise | (verb) grant freedom to; as from slavery or servitude | Synonyms: enfranchise |
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| affusion | (noun) the act of baptizing someone by pouring water on their head | - |
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| aforesaid | (adjective) being the one previously mentioned or spoken of | Synonyms: aforementioned, said |
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| afresh | (adverb) again but in a new or different way | Synonyms: anew |
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| aftermost | (adjective) located closest to the stern or tail | - |
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| afterpains | (noun) pains felt by a woman after her baby is born; associated with contractions of the uterus | - |
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| afters | (noun) a dish served as the last course of a meal | Synonyms: dessert, sweet |
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| aftersensation | (noun) an image (usually a negative image) that persists after stimulation has ceased | Synonyms: afterimage |
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| aftershaft | (noun) a supplementary feather (usually small) on the underside of the base of the shaft of some feathers in some birds | - |
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| aftershafted | (adjective) having an aftershaft (a small feather at the base of some feathers) | - |
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| aftershock | (noun) a tremor (or one of a series of tremors) occurring after the main shock of an earthquake | - |
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| aftertaste | (noun) an afterimage of a taste | - |
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| afterwards | (adverb) happening at a time subsequent to a reference time | Synonyms: after, afterward, later, later on, subsequently |
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| agalactosis | (noun) a condition in which milk is not secreted in the mother's breasts after her child has been delivered | Synonyms: agalactia |
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| agamogenesis | (noun) reproduction without the fusion of gametes | Synonyms: asexual reproduction |
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| agamous | (adjective) (of reproduction) not involving the fusion of male and female gametes in reproduction | Synonyms: agamic, agamogenetic, apomictic, parthenogenetic |
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| agapanthus | (noun) any of various plants of the genus Agapanthus having umbels of showy blue to purple flowers | Synonyms: lily of the Nile |
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| agedness | (noun) the property characteristic of old age | Synonyms: senescence |
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| ageism | (noun) discrimination on the basis of a person's age | Synonyms: agism |
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| ageless | (adjective) continuing forever or indefinitely | Synonyms: aeonian, eonian, eternal, everlasting, perpetual, unceasing, unending |
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| agelessness | (noun) the quality of being timeless and eternal | - |
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| agenesia | (noun) imperfect development; nondevelopment of a part | Synonyms: agenesis |
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| agenesis | (noun) imperfect development; nondevelopment of a part | Synonyms: agenesia |
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| agerasia | (noun) youthful appearance in an old person | - |
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| aggrandise | (verb) add details to | Synonyms: aggrandize, blow up, dramatise, dramatize, embellish, embroider, lard, pad |
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| aggrandisement | (noun) the act of increasing the wealth or prestige or power or scope of something | Synonyms: aggrandizement, elevation |
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| aggress | (verb) take the initiative and go on the offensive | Synonyms: attack |
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| aggression | (noun) violent action that is hostile and usually unprovoked | Synonyms: hostility |
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| (noun) deliberately unfriendly behavior | - |
| (noun) the act of initiating hostilities | - |
| (noun) a disposition to behave aggressively | - |
| (noun) a feeling of hostility that arouses thoughts of attack | Synonyms: aggressiveness |
| aggressive | (adjective) having or showing determination and energetic pursuit of your ends | - |
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| (adjective) characteristic of an enemy or one eager to fight | Synonyms: belligerent |
| (adjective) tending to spread quickly | Synonyms: fast-growing, strong-growing |
| aggressively | (adverb) in an aggressive manner | Synonyms: sharply |
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| aggressiveness | (noun) the quality of being bold and enterprising | - |
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| (noun) a natural disposition to be hostile | Synonyms: belligerence, pugnacity |
| (noun) a feeling of hostility that arouses thoughts of attack | Synonyms: aggression |
| aggressor | (noun) someone who attacks | Synonyms: assailant, assaulter, attacker |
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| (noun) a confident assertive person who acts as instigator | - |
| aghast | (adjective) struck with fear, dread, or consternation | Synonyms: appalled, dismayed, shocked |
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| agism | (noun) discrimination on the basis of a person's age | Synonyms: ageism |
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| agnise | (verb) be fully aware or cognizant of | Synonyms: agnize, realise, realize, recognise, recognize |
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| agnosia | (noun) inability to recognize objects by use of the senses | - |
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| agnostic | (adjective) uncertain of all claims to knowledge | Synonyms: agnostical |
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| (adjective) of or pertaining to an agnostic or agnosticism | - |
| (noun) a person who claims that they cannot have true knowledge about the existence of God (but does not deny that God might exist) | - |
| (noun) someone who is doubtful or noncommittal about something | Synonyms: doubter |
| agnostical | (adjective) uncertain of all claims to knowledge | Synonyms: agnostic |
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| agnosticism | (noun) the disbelief in any claims of ultimate knowledge | Synonyms: scepticism, skepticism |
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| (noun) a religious orientation of doubt; a denial of ultimate knowledge of the existence of God | - |
| agonise | (verb) suffer agony or anguish | Synonyms: agonize |
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| (verb) cause to agonize | Synonyms: agonize |
| agonised | (adjective) expressing pain or agony | Synonyms: agonized |
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| agonising | (adjective) extremely painful | Synonyms: agonizing, excruciating, harrowing, torturesome, torturing, torturous |
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| agonist | (noun) (biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction | - |
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| (noun) a muscle that contracts while another relaxes | - |
| (noun) someone involved in a contest or battle (as in an agon) | - |
| (noun) the principal character in a work of fiction | Synonyms: protagonist |
| agonistic | (adjective) of or relating to the athletic contests held in ancient Greece | - |
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| (adjective) struggling for effect | Synonyms: strained |
| (adjective) striving to overcome in argument | Synonyms: agonistical, combative |
| agonistical | (adjective) striving to overcome in argument | Synonyms: agonistic, combative |
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| agranulocytosis | (noun) an acute blood disorder (often caused by radiation or drug therapy) characterized by severe reduction in granulocytes | Synonyms: agranulosis, granulocytopenia |
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| agranulosis | (noun) an acute blood disorder (often caused by radiation or drug therapy) characterized by severe reduction in granulocytes | Synonyms: agranulocytosis, granulocytopenia |
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| agreeableness | (noun) a temperamental disposition to be agreeable | Synonyms: agreeability |
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| (noun) pleasantness resulting from agreeable conditions | Synonyms: amenity |
| agrestic | (adjective) characteristic of the fields or country | Synonyms: rustic |
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| (adjective) (of behavior) rustic and uncouth | - |
| agribusiness | (noun) a large-scale farming enterprise | Synonyms: agriculture, factory farm |
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| agriculturalist | (noun) someone concerned with the science or art or business of cultivating the soil | Synonyms: agriculturist, cultivator, grower, raiser |
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| agriculturist | (noun) someone concerned with the science or art or business of cultivating the soil | Synonyms: agriculturalist, cultivator, grower, raiser |
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| agronomist | (noun) an expert in soil management and field-crop production | - |
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| aguish | (adjective) affected by ague | - |
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| ahimsa | (noun) a Buddhist and Hindu and especially Jainist doctrine holding that all forms of life are sacred and urging the avoidance of violence | - |
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| ahistorical | (adjective) unconcerned with or unrelated to history or to historical development or to tradition | - |
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| ahorse | (adjective) traveling on horseback | Synonyms: ahorseback |
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| (adverb) on the back of a horse | Synonyms: ahorseback, horseback |
| ahorseback | (adjective) traveling on horseback | Synonyms: ahorse |
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| (adverb) on the back of a horse | Synonyms: ahorse, horseback |
| ailanthus | (noun) any of several deciduous Asian trees of the genus Ailanthus | - |
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| aimless | (adjective) aimlessly drifting | Synonyms: adrift, afloat, directionless, planless, rudderless, undirected |
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| (adjective) continually changing especially as from one abode or occupation to another | Synonyms: drifting, floating, vagabond, vagrant |
| aimlessly | (adverb) without aim; in an aimless manner | - |
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| aimlessness | (noun) the quality of lacking any definite purpose | Synonyms: purposelessness |
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| airbrush | (noun) an atomizer to spray paint by means of compressed air | - |
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| (verb) paint with an airbrush | - |
| airburst | (noun) an explosion in the atmosphere | - |
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| airbus | (noun) a subsonic jet airliner operated over short distances | - |
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| aircraftsman | (noun) a noncommissioned officer in the British Royal Air Force | Synonyms: aircraftman |
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| airiness | (noun) the property of something weightless and insubstantial | Synonyms: buoyancy |
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| (noun) the property of something spacious and abounding in fresh air | - |
| (noun) lightness in movement or manner | Synonyms: delicacy |
| airless | (adjective) lacking fresh air | Synonyms: close, stuffy, unaired |
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| airmanship | (noun) the art of operating aircraft | Synonyms: aviation |
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| airpost | (noun) a system of conveying mail by aircraft | Synonyms: airmail |
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| airs | (noun) affected manners intended to impress others | Synonyms: pose |
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| airscrew | (noun) a propeller that rotates to push against air | Synonyms: airplane propeller, prop |
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| airship | (noun) a steerable self-propelled aircraft | Synonyms: dirigible |
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| airsick | (adjective) experiencing motion sickness | Synonyms: air sick, carsick, seasick |
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| airsickness | (noun) motion sickness experienced while traveling by air (especially during turbulence) | Synonyms: air sickness |
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| airspace | (noun) the atmosphere above a nation that is deemed to be under its jurisdiction | - |
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| (noun) the space in the atmosphere immediately above the earth | Synonyms: air space |
| airspeed | (noun) the speed of an aircraft relative to the air in which it is flying | - |
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| airstream | (noun) a relatively well-defined prevailing wind | - |
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| (noun) the flow of air that is driven backwards by an aircraft propeller | Synonyms: backwash, race, slipstream, wash |
| airstrip | (noun) an airfield without normal airport facilities | Synonyms: flight strip, landing strip, strip |
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| airworthiness | (noun) fitness to fly | - |
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| aisle | (noun) passageway between seating areas as in an auditorium or passenger vehicle or between areas of shelves of goods as in stores | Synonyms: gangway |
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| (noun) part of a church divided laterally from the nave proper by rows of pillars or columns | - |
| (noun) a long narrow passage (as in a cave or woods) | - |
| akinesia | (noun) motionlessness attributable to a temporary paralysis | Synonyms: akinesis |
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| akinesis | (noun) motionlessness attributable to a temporary paralysis | Synonyms: akinesia |
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| alabaster | (adjective) of or resembling alabaster | Synonyms: alabastrine |
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| (noun) a very light white | - |
| (noun) a compact fine-textured, usually white gypsum used for carving | - |
| (noun) a hard compact kind of calcite | Synonyms: Mexican onyx, onyx marble, oriental alabaster |
| alabastrine | (adjective) of or resembling alabaster | Synonyms: alabaster |
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| alacritous | (adjective) quick and eager | - |
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| alarmism | (noun) needless warnings | - |
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| alarmist | (noun) a person who alarms others needlessly | - |
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| alas | (adverb) by bad luck | Synonyms: regrettably, unfortunately, unluckily |
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| alastrim | (noun) a mild form of smallpox caused by a less virulent form of the virus | Synonyms: Cuban itch, Kaffir pox, milk pox, pseudosmallpox, pseudovariola, variola minor, West Indian smallpox, white pox |
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| albatross | (noun) large web-footed birds of the Southern Hemisphere having long narrow wings; noted for powerful gliding flight | Synonyms: mollymawk |
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| (noun) (figurative) something that hinders or handicaps | Synonyms: millstone |
| albescent | (adjective) becoming or shading into white | - |
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| albinism | (noun) the congenital absence of pigmentation in the eyes and skin and hair | - |
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| albinistic | (adjective) of or pertaining to or affected by albinism | Synonyms: albinal, albinic, albinotic |
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| albuminous | (adjective) relating to or containing or resembling albumin | - |
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| alcahest | (noun) hypothetical universal solvent once sought by alchemists | Synonyms: alkahest, universal solvent |
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