| adulteration | (noun) the act of adulterating (especially the illicit substitution of one substance for another) | - |
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| (noun) being mixed with extraneous material; the product of adulterating | Synonyms: debasement |
| adulterator | (noun) a changer who lessens the purity or effectiveness of a substance | - |
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| (noun) any substance that lessens the purity or effectiveness of a substance | Synonyms: adulterant |
| adulterousness | (noun) The quality of being adulterous, involving sexual intercourse by a married person with someone other than their spouse. | - |
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| adulthood | (noun) the state (and responsibilities) of a person who has attained maturity | - |
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| (noun) the period of time in your life after your physical growth has stopped and you are fully developed | Synonyms: maturity |
| adumbration | (noun) a sketchy or imperfect or faint representation | - |
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| (noun) the act of providing vague advance indications; representing beforehand | Synonyms: foreshadowing, prefiguration |
| advantageousness | (noun) the quality of being encouraging or promising of a successful outcome | Synonyms: favorableness, favourableness, positiveness, positivity, profitableness |
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| advection | (noun) (meteorology) the horizontal transfer of heat or other atmospheric properties | - |
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| adventurousness | (noun) the trait of being adventurous | Synonyms: venturesomeness |
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| advertorial | (noun) an advertisement that is written and presented in the style of an editorial or journalistic report | - |
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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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| advocacy | (noun) active support of an idea or cause etc.; especially the act of pleading or arguing for something | Synonyms: protagonism |
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| advocate | (noun) a person who pleads for a cause or propounds an idea | Synonyms: advocator, exponent, proponent |
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| (noun) a lawyer who pleads cases in court | Synonyms: counsel, counsellor, counselor-at-law, counselor, pleader |
| advocator | (noun) a person who pleads for a cause or propounds an idea | Synonyms: advocate, exponent, proponent |
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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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| aeon | (noun) (Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe | Synonyms: eon |
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| (noun) an immeasurably long period of time | Synonyms: eon |
| (noun) the longest division of geological time | Synonyms: eon |
| aepyornis | (noun) huge (to 9 ft.) extinct flightless bird of Madagascar | Synonyms: elephant bird |
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| aeration | (noun) the act of charging a liquid with a gas making it effervescent | - |
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| (noun) the process of exposing to air (so as to purify) | - |
| aerator | (noun) an apparatus for exposing something to the air (as sewage) | - |
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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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| aerobe | (noun) an organism (especially a bacterium) that requires air or free oxygen for life | - |
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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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| aerodontalgia | (noun) pain in the teeth that results from a change in air pressure (as in flying or mountain climbing) | - |
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| aerodrome | (noun) an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo | Synonyms: airdrome, airport, drome |
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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 |
| aerofoil | (noun) a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | Synonyms: airfoil, control surface, surface |
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| aerogenerator | (noun) generator that extracts usable energy from winds | Synonyms: wind generator, windmill |
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| aerogram | (noun) a letter sent by air mail | Synonyms: aerogramme, air letter, airmail letter |
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| aerogramme | (noun) a letter sent by air mail | Synonyms: aerogram, air letter, airmail letter |
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| aerolite | (noun) a stony meteorite consisting of silicate minerals | - |
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| aerology | (noun) meteorology of the total extent of the atmosphere; especially the upper layers | - |
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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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| aeromedicine | (noun) the study and treatment of disorders associated with flight (especially with space flight) | Synonyms: aerospace medicine, aviation medicine |
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| aeronaut | (noun) someone who operates an aircraft | Synonyms: aviator, flier, flyer |
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| aeronautics | (noun) the theory and practice of navigation through air or space | Synonyms: astronautics |
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| aerophagia | (noun) swallowing air (usually followed by belching and discomfort and flatulence) | - |
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| aerophilately | (noun) the collection and study of airmail stamps | - |
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| aerophile | (noun) a lover of aviation | - |
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| aerophyte | (noun) plant that derives moisture and nutrients from the air and rain; usually grows on another plant but not parasitic on it | Synonyms: air plant, epiphyte, epiphytic plant |
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| aeroplane | (noun) an aircraft that has a fixed wing and is powered by propellers or jets | Synonyms: airplane, plane |
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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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| 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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| aetiology | (noun) the philosophical study of causation | Synonyms: etiology |
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| (noun) the cause of a disease | Synonyms: etiology |
| affectation | (noun) a deliberate pretense or exaggerated display | Synonyms: affectedness, mannerism, pose |
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| affection | (noun) a positive feeling of liking | Synonyms: affectionateness, fondness, heart, philia, tenderness, warmheartedness, warmness |
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| 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 |
| affiliation | (noun) the act of becoming formally connected or joined | - |
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| (noun) a social or business relationship | Synonyms: association, tie-up, tie |
| affirmation | (noun) a judgment by a higher court that the judgment of a lower court was correct and should stand | - |
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| (noun) a statement asserting the existence or the truth of something | Synonyms: avouchment, avowal |
| (noun) (religion) a solemn declaration that serves the same purpose as an oath (if an oath is objectionable to the person on religious or ethical grounds) | - |
| (noun) the act of affirming or asserting or stating something | Synonyms: assertion, statement |
| affixation | (noun) formation of a word by means of an affix | - |
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| (noun) the act of attaching or affixing something | Synonyms: attachment |
| (noun) the result of adding an affix to a root word | - |
| affliction | (noun) a cause of great suffering and distress | - |
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| (noun) a condition of suffering or distress due to ill health | - |
| (noun) a state of great suffering and distress due to adversity | - |
| afforestation | (noun) the conversion of bare or cultivated land into forest (originally for the purpose of hunting) | - |
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| affrication | (noun) the conversion of a simple stop consonant into an affricate | - |
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| affront | (noun) a deliberately offensive act or something producing the effect of deliberate disrespect | Synonyms: insult |
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| affusion | (noun) the act of baptizing someone by pouring water on their head | - |
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| afibrinogenemia | (noun) the absence of fibrinogen in the plasma leading to prolonged bleeding | - |
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| aficionado | (noun) a serious devotee of some particular music genre or musical performer | - |
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| (noun) a fan of bull fighting | - |
| aflatoxin | (noun) a potent carcinogen from the fungus Aspergillus; can be produced and stored for use as a bioweapon | - |
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| afropavo | (noun) both sexes are brightly colored | Synonyms: Afropavo congensis, Congo peafowl |
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| afterglow | (noun) the pleasure of remembering some pleasant event | - |
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| (noun) a glow sometimes seen in the sky after sunset | - |
| afternoon | (noun) a conventional expression of greeting or farewell, used to wish someone a good afternoon | Synonyms: good afternoon |
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| (noun) the part of the day between noon and evening | - |
| aftersensation | (noun) an image (usually a negative image) that persists after stimulation has ceased | Synonyms: afterimage |
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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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| afterthought | (noun) an addition that was not included in the original plan | - |
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| (noun) thinking again about a choice previously made | Synonyms: reconsideration, rethink, second thought |
| afterworld | (noun) the place where you are after you die | - |
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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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| agammaglobulinemia | (noun) a rare immunological disorder characterized by the virtual absence of gamma globulin in the blood and consequent susceptibility to infection | - |
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| agamogenesis | (noun) reproduction without the fusion of gametes | Synonyms: asexual reproduction |
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| agglomerate | (noun) a collection of objects laid on top of each other | Synonyms: cumulation, cumulus, heap, mound, pile |
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| (noun) volcanic rock consisting of large fragments fused together | - |
| agglomeration | (noun) the act of collecting in a mass; the act of agglomerating | - |
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| (noun) a jumbled collection or mass | - |
| agglomerator | (noun) a device that causes material to gather into rounded balls | - |
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| agglutination | (noun) the building of words from component morphemes that retain their form and meaning in the process of combining | - |
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| (noun) a clumping of bacteria or red cells when held together by antibodies (agglutinins) | - |
| (noun) the coalescing of small particles that are suspended in solution; these larger masses are then (usually) precipitated | Synonyms: agglutinating activity |
| agglutinogen | (noun) any substance that acts as an antigen to cause agglutinin production | - |
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| aggravation | (noun) unfriendly behavior that causes anger or resentment | Synonyms: irritation, provocation |
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| (noun) action that makes a problem or a disease (or its symptoms) worse | Synonyms: exacerbation |
| (noun) an exasperated feeling of annoyance | Synonyms: exasperation |
| aggravator | (noun) an unpleasant person who is annoying or exasperating | Synonyms: annoyance |
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| aggregation | (noun) the act of gathering something together | Synonyms: assembling, collecting, collection |
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| (noun) several things grouped together or considered as a whole | Synonyms: accumulation, assemblage, collection |
| aggregator | (noun) a person who collects things | Synonyms: collector |
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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 |
| aggressor | (noun) someone who attacks | Synonyms: assailant, assaulter, attacker |
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| (noun) a confident assertive person who acts as instigator | - |
| aggro | (noun) (informal British usage) aggravation or aggression | - |
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| agio | (noun) a fee charged for exchanging currencies | Synonyms: agiotage, exchange premium, premium |
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| agiotage | (noun) a fee charged for exchanging currencies | Synonyms: agio, exchange premium, premium |
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| (noun) speculative dealing in stock exchange securities or foreign exchange. | - |
| agitation | (noun) disturbance usually in protest | Synonyms: excitement, hullabaloo, turmoil, upheaval |
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| (noun) the act of agitating something; causing it to move around (usually vigorously) | - |
| (noun) the feeling of being agitated; not calm | - |
| (noun) a state of agitation or turbulent change or development | Synonyms: ferment, fermentation, tempestuousness, unrest |
| (noun) a mental state of extreme emotional disturbance | - |
| agitator | (noun) one who agitates; a political troublemaker | Synonyms: fomenter |
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| agitprop | (noun) political propaganda (especially communist propaganda) communicated via art and literature and cinema | - |
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| 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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