| advantageous | (adjective) giving an advantage | Synonyms: favorable, favourable |
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| (adjective) appropriate for achieving a particular end; implies a lack of concern for fairness | - |
| advantageousness | (noun) the quality of being encouraging or promising of a successful outcome | Synonyms: favorableness, favourableness, positiveness, positivity, profitableness |
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| adventitious | (adjective) associated by chance and not an integral part | - |
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| adventuress | (noun) a woman adventurer | - |
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| adventurous | (adjective) willing to undertake or seeking out new and daring enterprises | Synonyms: adventuresome |
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| adventurousness | (noun) the trait of being adventurous | Synonyms: venturesomeness |
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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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| aerides | (noun) any orchid of the genus Aerides | - |
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| aeriferous | (adjective) conveying air; as the bronchial tubes | - |
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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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| 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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| aerophilous | (adjective) depending on free oxygen or air | Synonyms: aerobic, aerophilic |
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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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| aesthesis | (noun) an unelaborated elementary awareness of stimulation | Synonyms: esthesis, sensation, sense datum, sense experience, sense impression |
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| 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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| 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 |
| 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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| 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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| 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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| 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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| agenesis | (noun) imperfect development; nondevelopment of a part | Synonyms: agenesia |
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| aggress | (verb) take the initiative and go on the offensive | Synonyms: attack |
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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 |
| 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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| 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 |
| aimlessness | (noun) the quality of lacking any definite purpose | Synonyms: purposelessness |
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| airbus | (noun) a subsonic jet airliner operated over short distances | - |
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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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| airs | (noun) affected manners intended to impress others | Synonyms: pose |
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| airsickness | (noun) motion sickness experienced while traveling by air (especially during turbulence) | Synonyms: air sickness |
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| airworthiness | (noun) fitness to fly | - |
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| akinesis | (noun) motionlessness attributable to a temporary paralysis | Synonyms: akinesia |
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| alacritous | (adjective) quick and eager | - |
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| alas | (adverb) by bad luck | Synonyms: regrettably, unfortunately, unluckily |
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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 |
| albuminous | (adjective) relating to or containing or resembling albumin | - |
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| alertness | (noun) lively attentiveness | Synonyms: on the qui vive, sharp-sightedness |
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| (noun) the process of paying close and continuous attention | Synonyms: vigilance, wakefulness, watchfulness |
| (noun) a state of readiness to respond | Synonyms: alerting |
| alias | (noun) a name that has been assumed | Synonyms: assumed name, false name |
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| (adverb) as known or named at another time or place | Synonyms: a.k.a., also known as |
| alikeness | (noun) similarity in appearance or character or nature between persons or things | Synonyms: likeness, similitude |
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| aliveness | (noun) the property of being animated; having animal life as distinguished from plant life | Synonyms: animateness, liveness |
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| (noun) the condition of living or the state of being alive | Synonyms: animation, life, living |
| alkalosis | (noun) abnormally high alkalinity (low hydrogen-ion concentration) of the blood and other body tissues | - |
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| allantois | (noun) the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals) | - |
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| allegoresis | (noun) the interpretation of written, oral, or artistic expression as allegory. | - |
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| allegoricalness | (noun) The state or quality of being allegorical. | - |
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| alliaceous | (adjective) of or pertaining to the botanical genus Allium | - |
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| (adjective) smelling of onions or garlic | - |
| allies | (noun) an alliance of nations joining together to fight a common enemy | - |
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| allis | (noun) European shad | Synonyms: allice, allice shad, allis shad, Alosa alosa |
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| allochthonous | (adjective) of rocks, deposits, etc.; found in a place other than where they and their constituents were formed | - |
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| allogamous | (adjective) relating to cross-fertilization in plants | - |
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| allomerous | (adjective) pertaining to allomerism | - |
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| allosaurus | (noun) late Jurassic carnivorous dinosaur; similar to but somewhat smaller than tyrannosaurus | Synonyms: allosaur |
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| allusiveness | (noun) a quality characterized by indirect reference | - |
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| alms | (noun) money or goods contributed to the poor | - |
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| aloes | (noun) a purgative made from the leaves of aloe | Synonyms: bitter aloes |
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| aloneness | (noun) a disposition toward being alone | Synonyms: loneliness, lonesomeness, solitariness |
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| aloofness | (noun) a disposition to be distant and unsympathetic in manner | Synonyms: remoteness, standoffishness, withdrawnness |
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| (noun) indifference by personal withdrawal | Synonyms: distance |
| alphanumerics | (noun) a character set that includes letters and digits and punctuation | Synonyms: alphanumeric characters |
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| alphavirus | (noun) an arbovirus of the family Togaviridae that can cause a variety of encephalitis in horses | - |
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| altitudinous | (adjective) indefinitely high; lofty | - |
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| altocumulus | (noun) a cumulus cloud at an intermediate altitude of 2 or 3 miles | Synonyms: altocumulus cloud |
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| altostratus | (noun) a stratus cloud at an intermediate altitude of 2 or 3 miles | Synonyms: altostratus cloud |
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| aluminiferous | (adjective) containing alum or aluminum | - |
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| aluminous | (adjective) pertaining to or containing aluminum or alum | - |
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| alumnus | (noun) a male person who has received a degree from a school (high school or college or university) | - |
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| alveolitis | (noun) inflammation of the alveoli in the lungs caused by inhaling dust; with repeated exposure the condition may become chronic | - |
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| (noun) inflammation in the socket of a tooth; sometimes occurs after a tooth is extracted and a blood clot fails to form | Synonyms: dry socket |
| alveolus | (noun) a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways | Synonyms: air cell, air sac |
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| (noun) a bony socket in the alveolar ridge that holds a tooth | Synonyms: tooth socket |
| always | (adverb) at all times; all the time and on every occasion | Synonyms: e'er, ever |
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| (adverb) forever; throughout all time | - |
| (adverb) at any time or in any event | - |
| (adverb) invariably | Synonyms: constantly, forever, incessantly, perpetually |
| (adverb) without variation or change, in every case | Synonyms: constantly, invariably |
| amanuensis | (noun) someone skilled in the transcription of speech (especially dictation) | Synonyms: shorthand typist, stenographer |
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| amaryllis | (noun) bulbous plant having showy white to reddish flowers | - |
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| amass | (verb) increase in amount by collecting or gathering | Synonyms: accumulate, conglomerate, cumulate, gather, pile up |
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| (verb) get or gather together | Synonyms: accumulate, collect, compile, hoard, pile up, roll up |
| amateurishness | (noun) something that demonstrates a lack of professional competency | - |
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| amativeness | (noun) the arousal of feelings of sexual desire | Synonyms: amorousness, eroticism, erotism, sexiness |
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| amaurosis | (noun) partial or total loss of sight without pathology of the eye; caused by disease of optic nerve or retina or brain | - |
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| ambages | (noun) (archaic) roundabout or mysterious ways of action | - |
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| ambagious | (adjective) roundabout and unnecessarily wordy | Synonyms: circumlocutious, circumlocutory, periphrastic |
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| ambassadress | (noun) a woman ambassador | - |
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| ambergris | (noun) waxy substance secreted by the sperm whale and found floating at sea or washed ashore; used in perfume | - |
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| ambidextrous | (adjective) equally skillful with each hand | Synonyms: two-handed |
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| (adjective) marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another | Synonyms: deceitful, double-dealing, double-faced, double-tongued, duplicitous, Janus-faced, two-faced |
| ambidextrousness | (noun) the property of being equally skillful with each hand | Synonyms: ambidexterity |
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