| agnation | (noun) line of descent traced through the paternal side of the family | Synonyms: patrilineage |
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| agnomen | (noun) an additional name or an epithet appended to a name (as in `Ferdinand the Great') | - |
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| agnosia | (noun) inability to recognize objects by use of the senses | - |
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| agnostic | (noun) a person who claims that they cannot have true knowledge about the existence of God (but does not deny that God might exist) | - |
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| (noun) someone who is doubtful or noncommittal about something | Synonyms: doubter |
| 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 | - |
| agon | (noun) a festivity in ancient Greece at which competitors contended for prizes | - |
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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 |
| agony | (noun) intense feelings of suffering; acute mental or physical pain | Synonyms: torment, torture |
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| (noun) a state of acute pain | Synonyms: excruciation, suffering |
| agora | (noun) 100 agorot equal 1 shekel in Israel | - |
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| (noun) a place of assembly for the people in ancient Greece | Synonyms: public square |
| (noun) the marketplace in ancient Greece | - |
| agoraphobia | (noun) a morbid fear of open spaces (as fear of being caught alone in some public place) | - |
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| agouti | (noun) agile long-legged rabbit-sized rodent of Central America and South America and the West Indies; valued as food | Synonyms: Dasyprocta aguti |
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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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| agrapha | (noun) sayings of Jesus not recorded in the canonical Gospels | - |
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| agraphia | (noun) a loss of the ability to write or to express thoughts in writing because of a brain lesion | Synonyms: anorthography, logagraphia |
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| agraphon | (noun) (usually plural) a saying of Jesus not in the canonical gospels but found in other New Testament or early Christian writings. | - |
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| agreeability | (noun) a temperamental disposition to be agreeable | Synonyms: agreeableness |
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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 |
| agreement | (noun) compatibility of observations | Synonyms: correspondence |
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| (noun) the thing arranged or agreed to | Synonyms: arrangement |
| (noun) the verbal act of agreeing | - |
| (noun) the statement (oral or written) of an exchange of promises | Synonyms: understanding |
| (noun) the determination of grammatical inflection on the basis of word relations | Synonyms: concord |
| (noun) harmony of people's opinions or actions or characters | Synonyms: accord |
| 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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| agriculture | (noun) the practice of cultivating the land or raising stock | Synonyms: farming, husbandry |
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| (noun) a large-scale farming enterprise | Synonyms: agribusiness, factory farm |
| (noun) the class of people engaged in growing food | - |
| agriculturist | (noun) someone concerned with the science or art or business of cultivating the soil | Synonyms: agriculturalist, cultivator, grower, raiser |
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| agrimonia | (noun) a plant of the genus Agrimonia having spikelike clusters of small yellow flowers | Synonyms: agrimony |
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| agrimony | (noun) a plant of the genus Agrimonia having spikelike clusters of small yellow flowers | Synonyms: agrimonia |
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| agrobiology | (noun) the study of plant nutrition and growth especially as a way to increase crop yield | - |
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| agrology | (noun) science of soils in relation to crops | - |
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| agromania | (noun) an intense desire to be alone or out in the open | - |
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| agronomist | (noun) an expert in soil management and field-crop production | - |
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| agronomy | (noun) the application of soil and plant sciences to land management and crop production | Synonyms: scientific agriculture |
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| agrypnia | (noun) a vigil before certain feasts (as e.g. Easter) | - |
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| agua | (noun) largest known toad species; native to Central America; valuable destroyer of insect pests | Synonyms: agua toad, Bufo marinus |
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| aguacate | (noun) a pear-shaped tropical fruit with green or blackish skin and rich yellowish pulp enclosing a single large seed | Synonyms: alligator pear, avocado, avocado pear |
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| ague | (noun) a mark placed above a vowel to indicate pronunciation | Synonyms: acute, acute accent |
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| (noun) a fit of shivering or shaking | - |
| (noun) successive stages of chills and fever that is a symptom of malaria | Synonyms: chills and fever |
| agueweed | (noun) gentian of eastern North America having clusters of bristly blue flowers | Synonyms: ague weed, five-flowered gentian, Gentiana quinquefolia, Gentianella quinquefolia, stiff gentian |
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| (noun) perennial herb of southeastern United States having white-rayed flower heads; formerly used as in folk medicine | Synonyms: boneset, Eupatorium perfoliatum, thoroughwort |
| ahem | (noun) the utterance of a sound similar to clearing the throat; intended to get attention, express hesitancy, fill a pause, hide embarrassment, warn a friend, etc. | Synonyms: hem |
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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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| ai | (noun) a sloth that has three long claws on each forefoot and each hindfoot | Synonyms: Bradypus tridactylus, three-toed sloth |
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| aid | (noun) the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose | Synonyms: assist, assistance, help |
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| (noun) the work of providing treatment for or attending to someone or something | Synonyms: attention, care, tending |
| (noun) a person or thing that is a resource that helps make something easier or possible to do | Synonyms: assistance, help |
| (noun) gift of money or other material help to support a person or cause | Synonyms: assistance, economic aid, economic assistance, financial aid, financial assistance |
| aide | (noun) someone who acts as assistant | Synonyms: auxiliary |
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| (noun) an officer who acts as military assistant to a more senior officer | Synonyms: adjutant, aide-de-camp |
| aiglet | (noun) ornamental tagged cord or braid on the shoulder of a uniform | Synonyms: aglet, aiguillette |
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| (noun) metal or plastic sheath over the end of a shoelace or ribbon | Synonyms: aglet |
| aigret | (noun) a long plume (especially one of egret feathers) worn on a hat or a piece of jewelry in the shape of a plume | Synonyms: aigrette |
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| aigrette | (noun) a long plume (especially one of egret feathers) worn on a hat or a piece of jewelry in the shape of a plume | Synonyms: aigret |
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| aiguillette | (noun) ornamental tagged cord or braid on the shoulder of a uniform | Synonyms: aglet, aiglet |
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| aikido | (noun) a Japanese martial art employing principles similar to judo | - |
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| ail | (noun) aromatic bulb used as seasoning | Synonyms: garlic |
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| ailanthus | (noun) any of several deciduous Asian trees of the genus Ailanthus | - |
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| aileron | (noun) an airfoil that controls lateral motion | - |
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| ailment | (noun) an often persistent bodily disorder or disease; a cause for complaining | Synonyms: complaint, ill |
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| ailurophobia | (noun) a morbid fear of cats | - |
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| aim | (noun) the action of directing something at an object | - |
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| (noun) an anticipated outcome that is intended or that guides your planned actions | Synonyms: design, intent, intention, purpose |
| (noun) the goal intended to be attained (and which is believed to be attainable) | Synonyms: object, objective, target |
| (noun) the direction or path along which something moves or along which it lies | Synonyms: bearing, heading |
| aimlessness | (noun) the quality of lacking any definite purpose | Synonyms: purposelessness |
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| aioli | (noun) garlic mayonnaise | Synonyms: aioli sauce, garlic sauce |
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| air | (noun) travel via aircraft | Synonyms: air travel, aviation |
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| (noun) a distinctive but intangible quality surrounding a person or thing | Synonyms: atmosphere, aura |
| (noun) a succession of notes forming a distinctive sequence | Synonyms: line, melodic line, melodic phrase, melody, strain, tune |
| (noun) medium for radio and television broadcasting | Synonyms: airwave |
| (noun) the region above the ground | - |
| (noun) the mass of air surrounding the Earth | Synonyms: atmosphere |
| (noun) a slight wind (usually refreshing) | Synonyms: breeze, gentle wind, zephyr |
| (noun) a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of | - |
| (noun) once thought to be one of four elements composing the universe (Empedocles), associated with the humour blood | - |
| airbrake | (noun) a vehicular brake that operates by compressed air; especially for heavy vehicles | - |
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| (noun) a small parachute or articulated flap to reduce the speed of an aircraft | Synonyms: dive brake |
| airbrush | (noun) an atomizer to spray paint by means of compressed air | - |
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| 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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| aircraft | (noun) a vehicle that can fly | - |
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| aircraftman | (noun) a noncommissioned officer in the British Royal Air Force | Synonyms: aircraftsman |
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| aircraftsman | (noun) a noncommissioned officer in the British Royal Air Force | Synonyms: aircraftman |
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| aircrew | (noun) the crew of an aircraft | Synonyms: air crew |
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| aircrewman | (noun) a member of an aircrew | - |
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| airdock | (noun) a large structure at an airport where aircraft can be stored and maintained | Synonyms: hangar, repair shed |
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| airdrome | (noun) an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo | Synonyms: aerodrome, airport, drome |
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| airdrop | (noun) delivery of supplies or equipment or personnel by dropping them by parachute from an aircraft | - |
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| airfare | (noun) the fare charged for traveling by airplane | - |
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| airfield | (noun) a place where planes take off and land | Synonyms: field, flying field, landing field |
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| airflow | (noun) the flow of air | Synonyms: air flow, flow of air |
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| airfoil | (noun) a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | Synonyms: aerofoil, control surface, surface |
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| airforce | (noun) the airborne branch of a country's armed forces | Synonyms: air force |
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| airframe | (noun) the framework and covering of an airplane or rocket (excluding the engines) | - |
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| airgun | (noun) a gun that propels a projectile by compressed air | Synonyms: air gun, air rifle |
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| airhead | (noun) a bridgehead seized by airborne troops | - |
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| (noun) a flighty scatterbrained simpleton | - |
| 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 |
| airing | (noun) the act of supplying fresh air and getting rid of foul air | Synonyms: ventilation |
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| (noun) a short excursion (a walk or ride) in the open air | - |
| (noun) the opening of a subject to widespread discussion and debate | Synonyms: dissemination, public exposure, spreading |
| airlift | (noun) transportation of people or goods by air (especially when other means of access are unavailable) | Synonyms: lift |
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| airline | (noun) a commercial enterprise that provides scheduled flights for passengers | Synonyms: airline business, airway |
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| (noun) a hose that carries air under pressure | Synonyms: air hose |
| airliner | (noun) a commercial airplane that carries passengers | - |
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| airlock | (noun) a chamber that provides access to space where air is under pressure | Synonyms: air lock |
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| airmail | (noun) a system of conveying mail by aircraft | Synonyms: airpost |
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| (noun) letters and packages that are transported by aircraft | - |
| airmailer | (noun) a mailer for airmail | - |
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| airman | (noun) a male who operates an aircraft | - |
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| airmanship | (noun) the art of operating aircraft | Synonyms: aviation |
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| airplane | (noun) an aircraft that has a fixed wing and is powered by propellers or jets | Synonyms: aeroplane, plane |
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| airport | (noun) an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo | Synonyms: aerodrome, airdrome, drome |
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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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| 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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| airwave | (noun) medium for radio and television broadcasting | Synonyms: air |
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| airway | (noun) a commercial enterprise that provides scheduled flights for passengers | Synonyms: airline, airline business |
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| (noun) a duct that provides ventilation (as in mines) | Synonyms: air duct, air passage |
| (noun) the passages through which air enters and leaves the body | Synonyms: respiratory tract |
| (noun) a designated route followed by airplanes in flying from one airport to another | Synonyms: air lane, flight path, skyway |
| airwoman | (noun) a woman aviator | Synonyms: aviatress, aviatrix |
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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) | - |