| adventurism | (noun) recklessness in politics or foreign affairs | - |
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| adventurousness | (noun) the trait of being adventurous | Synonyms: venturesomeness |
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| adversary | (noun) someone who offers opposition | Synonyms: antagonist, opponent, opposer, resister |
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| adversity | (noun) a stroke of ill fortune; a calamitous event | - |
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| (noun) a state of misfortune or affliction | Synonyms: hard knocks, hardship |
| advertisement | (noun) a public promotion of some product or service | Synonyms: ad, advert, advertising, advertizement, advertizing |
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| advertiser | (noun) someone whose business is advertising | Synonyms: adman, advertizer |
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| advertising | (noun) the business of drawing public attention to goods and services | Synonyms: merchandising, publicizing |
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| (noun) a public promotion of some product or service | Synonyms: ad, advert, advertisement, advertizement, advertizing |
| advisability | (noun) the quality of being advisable | - |
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| advisee | (noun) someone who receives advice | - |
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| advisement | (noun) careful consideration | Synonyms: deliberation, weighing |
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| adviser | (noun) an expert who gives advice | Synonyms: advisor, consultant |
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| advisor | (noun) an expert who gives advice | Synonyms: adviser, consultant |
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| advisory | (noun) an announcement that usually advises or warns the public of some threat | - |
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| advowson | (noun) the right in English law of presenting a nominee to a vacant ecclesiastical benefice | - |
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| aeciospore | (noun) spore of a rust fungus formed in an aecium | - |
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| aegis | (noun) kindly endorsement and guidance | Synonyms: auspices, protection |
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| (noun) armor plate that protects the chest; the front part of a cuirass | Synonyms: breastplate, egis |
| aepyornis | (noun) huge (to 9 ft.) extinct flightless bird of Madagascar | Synonyms: elephant bird |
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| aerialist | (noun) an acrobat who performs in the air (as on a rope or trapeze) | - |
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| aerides | (noun) any orchid of the genus Aerides | - |
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| aerobatics | (noun) the performance of stunts while in flight in an aircraft | Synonyms: acrobatics, stunt flying, stunting |
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| aerobics | (noun) exercise that increases the need for oxygen | Synonyms: aerobic exercise |
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| aerobiosis | (noun) life sustained in the presence of air or oxygen | - |
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| aerodynamics | (noun) the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow | Synonyms: aeromechanics |
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| aeroembolism | (noun) obstruction of the circulatory system caused by an air bubble as, e.g., accidentally during surgery or hypodermic injection or as a complication from scuba diving | Synonyms: air embolism, gas embolism |
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| (noun) pain resulting from rapid change in pressure | Synonyms: air embolism, bends, caisson disease, decompression sickness, gas embolism |
| aeromechanics | (noun) the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow | Synonyms: aerodynamics |
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| aeronautics | (noun) the theory and practice of navigation through air or space | Synonyms: astronautics |
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| aerosol | (noun) a dispenser that holds a substance under pressure and that can release it as a fine spray (usually by means of a propellant gas) | Synonyms: aerosol bomb, aerosol can, aerosol container, spray can |
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| (noun) a cloud of solid or liquid particles in a gas | - |
| aerospace | (noun) the atmosphere and outer space considered as a whole | - |
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| aeschynanthus | (noun) a plant of the genus Aeschynanthus having somewhat red or orange flowers and seeds having distinctive hairs at base and apex | - |
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| aesthesia | (noun) mental responsiveness and awareness | Synonyms: esthesia, sensibility |
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| aesthesis | (noun) an unelaborated elementary awareness of stimulation | Synonyms: esthesis, sensation, sense datum, sense experience, sense impression |
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| aesthete | (noun) one who professes great sensitivity to the beauty of art and nature | Synonyms: esthete |
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| aesthetic | (noun) (philosophy) a philosophical theory as to what is beautiful | Synonyms: esthetic |
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| aesthetician | (noun) a philosopher who specializes in the nature of beauty | Synonyms: esthetician |
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| (noun) a worker skilled in giving beauty treatments (manicures and facials etc.) | Synonyms: esthetician |
| aesthetics | (noun) (art) the branch of philosophy dealing with beauty and taste (emphasizing the evaluative criteria that are applied to art) | Synonyms: esthetics |
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| aestivation | (noun) (botany) the arrangement of sepals and petals in a flower bud before it opens | Synonyms: estivation |
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| (noun) (zoology) cessation or slowing of activity during the summer; especially slowing of metabolism in some animals during a hot or dry period | Synonyms: estivation |
| aetiologist | (noun) a specialist in the etiology of diseases | Synonyms: etiologist |
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| affableness | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affability, amiability, amiableness, bonhomie, geniality |
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| affairs | (noun) transactions of professional or public interest | - |
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| (noun) matters of personal concern | Synonyms: personal business, personal matters |
| affectedness | (noun) a deliberate pretense or exaggerated display | Synonyms: affectation, mannerism, pose |
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| (noun) the quality of being false or artificial (as to impress others) | - |
| affectionateness | (noun) a quality proceeding from feelings of affection or love | Synonyms: fondness, lovingness, warmth |
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| (noun) a positive feeling of liking | Synonyms: affection, fondness, heart, philia, tenderness, warmheartedness, warmness |
| affenpinscher | (noun) European breed of small dog resembling a terrier with dark wiry hair and a tufted muzzle | Synonyms: monkey dog, monkey pinscher |
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| 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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| afforestation | (noun) the conversion of bare or cultivated land into forest (originally for the purpose of hunting) | - |
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| affusion | (noun) the act of baptizing someone by pouring water on their head | - |
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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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| 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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| 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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| 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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| 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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| aggrandisement | (noun) the act of increasing the wealth or prestige or power or scope of something | Synonyms: aggrandizement, elevation |
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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 |
| 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 | - |
| agism | (noun) discrimination on the basis of a person's age | Synonyms: ageism |
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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 | - |
| 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 |
| 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 |
| 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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| 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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| ailanthus | (noun) any of several deciduous Asian trees of the genus Ailanthus | - |
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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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| 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 |
| 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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| 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 | (noun) a very light white | - |
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| (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 |