| adze | (noun) an edge tool used to cut and shape wood | Synonyms: adz |
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| aeciospore | (noun) spore of a rust fungus formed in an aecium | - |
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| aerie | (noun) any habitation at a high altitude | Synonyms: aery, eyrie, eyry |
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| (noun) the lofty nest of a bird of prey (such as a hawk or eagle) | Synonyms: aery, eyrie, eyry |
| aerobe | (noun) an organism (especially a bacterium) that requires air or free oxygen for life | - |
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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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| 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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| aeromedicine | (noun) the study and treatment of disorders associated with flight (especially with space flight) | Synonyms: aerospace medicine, aviation medicine |
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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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| aerospace | (noun) the atmosphere and outer space considered as a whole | - |
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| aesthete | (noun) one who professes great sensitivity to the beauty of art and nature | Synonyms: esthete |
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| affaire | (noun) a usually secretive or illicit sexual relationship | Synonyms: affair, amour, intimacy, involvement, liaison |
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| affiliate | (noun) a subsidiary or subordinate organization that is affiliated with another organization | - |
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| (noun) a subordinate or subsidiary associate; a person who is affiliated with another or with an organization | - |
| affine | (noun) (anthropology) kin by marriage | - |
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| affirmative | (noun) a reply of affirmation | - |
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| affluence | (noun) abundant wealth | Synonyms: richness |
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| affricate | (noun) a composite speech sound consisting of a stop and a fricative articulated at the same point (as `ch' in `chair' and `j' in `joy') | Synonyms: affricate consonant, affricative |
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| affricative | (noun) a composite speech sound consisting of a stop and a fricative articulated at the same point (as `ch' in `chair' and `j' in `joy') | Synonyms: affricate, affricate consonant |
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| aftercare | (noun) care and treatment of a convalescent patient | - |
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| afterimage | (noun) an image (usually a negative image) that persists after stimulation has ceased | Synonyms: aftersensation |
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| afterlife | (noun) life after death | Synonyms: hereafter |
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| afterpiece | (noun) a brief dramatic piece (usually comic) presented after a play | - |
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| aftertaste | (noun) an afterimage of a taste | - |
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| agamete | (noun) an asexual reproductive cell | - |
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| agape | (noun) a religious meal shared as a sign of love and fellowship | Synonyms: love feast |
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| (noun) selfless love of one person for another without sexual implications (especially love that is spiritual in nature) | Synonyms: agape love |
| (noun) (Christian theology) the love of God or Christ for mankind | - |
| agate | (noun) an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles | - |
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| agateware | (noun) pottery that is veined and mottled to resemble agate | - |
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| agave | (noun) tropical American plants with basal rosettes of fibrous sword-shaped leaves and flowers in tall spikes; some cultivated for ornament or for fiber | Synonyms: American aloe, century plant |
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| age | (noun) how long something has existed | - |
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| (noun) a time of life (usually defined in years) at which some particular qualification or power arises | Synonyms: eld |
| (noun) a late time of life | Synonyms: eld, geezerhood, old age, years |
| (noun) an era of history having some distinctive feature | Synonyms: historic period |
| (noun) a prolonged period of time | Synonyms: long time, years |
| 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 | - |
| aggregate | (noun) the whole amount | Synonyms: sum, total, totality |
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| (noun) a sum total of many heterogenous things taken together | Synonyms: congeries, conglomeration |
| (noun) material such as sand or gravel used with cement and water to make concrete, mortar, or plaster | - |
| 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. | - |
| agnate | (noun) one related on the father's side | Synonyms: patrikin, patrilineal kin, patrilineal sib, patrisib |
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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 | - |
| 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 |
| 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 |
| 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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| 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 |
| 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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| airfare | (noun) the fare charged for traveling by airplane | - |
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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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| 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 |
| airplane | (noun) an aircraft that has a fixed wing and is powered by propellers or jets | Synonyms: aeroplane, plane |
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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 |
| airwave | (noun) medium for radio and television broadcasting | Synonyms: air |
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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) | - |
| aitchbone | (noun) a cut of beef including the H-shaped rump bone | - |
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| akaryocyte | (noun) a cell without a nucleus (as an erythrocyte) | Synonyms: acaryote, akaryote |
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| akaryote | (noun) a cell without a nucleus (as an erythrocyte) | Synonyms: acaryote, akaryocyte |
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| akee | (noun) red pear-shaped tropical fruit with poisonous seeds; flesh is poisonous when unripe or overripe | Synonyms: ackee |
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| (noun) widely cultivated in tropical and subtropical regions for its fragrant flowers and colorful fruits; introduced in Jamaica by William Bligh | Synonyms: akee tree, Blighia sapida |
| alanine | (noun) a crystalline amino acid that occurs in many proteins | - |
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| albacore | (noun) large pelagic tuna the source of most canned tuna; reaches 93 pounds and has long pectoral fins; found worldwide in tropical and temperate waters | Synonyms: long-fin tunny, Thunnus alalunga |
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| (noun) relatively small tuna with choice white flesh; major source of canned tuna | - |
| albite | (noun) a widely distributed feldspar that forms rocks | Synonyms: white feldspar |
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| alcalde | (noun) a mayor or chief magistrate of a Spanish town | - |
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| alcove | (noun) a small recess opening off a larger room | Synonyms: bay |
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| aldehyde | (noun) any of a class of highly reactive chemical compounds; used in making resins and dyes and organic acids | - |
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| aldohexose | (noun) a monosaccharide sugar having six carbon atoms and an aldehyde group | - |
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| aldose | (noun) a monosaccharide sugar that contains the aldehyde group or is hemiacetal | - |
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| aldosterone | (noun) a corticosteroid hormone that is secreted by the cortex of the adrenal gland; regulates salt (sodium and potassium) and water balance | - |
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| aldotetrose | (noun) A four-carbon aldose; for example, threose, erythrose. | - |
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| aldotriose | (noun) Any aldose having three carbon atoms; in reality, just glyceraldehyde. | - |
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| ale | (noun) a general name for beer made with a top fermenting yeast; in some of the United States an ale is (by law) a brew of more than 4% alcohol by volume | - |
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| alehouse | (noun) a tavern where ale is sold | - |
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| alendronate | (noun) a tablet (trade name Fosamax) prescribed to prevent or treat osteoporosis in women after menopause | Synonyms: Fosamax |
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| aleurone | (noun) granular protein in outermost layer of endosperm of many seeds or cereal grains | - |
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| alewife | (noun) shad-like food fish that runs rivers to spawn; often salted or smoked; sometimes placed in genus Pomolobus | Synonyms: Alosa pseudoharengus, Pomolobus pseudoharengus |
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| (noun) flesh of shad-like fish abundant along the Atlantic coast or in coastal streams | - |
| alexandrite | (noun) a green variety of chrysoberyl used as a gemstone | - |
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| algae | (noun) primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves | Synonyms: alga |
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| alidade | (noun) surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles | Synonyms: alidad |
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| (noun) surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments | Synonyms: alidad |
| alienage | (noun) the quality of being alien | Synonyms: alienism |
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| alienee | (noun) someone to whom the title of property is transferred | Synonyms: grantee |
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| aliterate | (noun) a person who can read but is disinclined to derive information from literary sources | Synonyms: aliterate person |
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| alizarine | (noun) an orange-red crystalline compound used in making red pigments and in dyeing | Synonyms: alizarin |
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| alkane | (noun) a series of non-aromatic saturated hydrocarbons with the general formula CnH(2n+2) | Synonyms: alkane series, methane series, paraffin, paraffin series |
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| alkene | (noun) any unsaturated aliphatic hydrocarbon | Synonyms: olefin, olefine |
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| alkylbenzene | (noun) organic compound that has an alkyl group bound to a benzene ring | - |
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| alkylbenzenesulfonate | (noun) sulfonate of alkyl benzene | - |
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| alkyne | (noun) a colorless flammable gas used chiefly in welding and in organic synthesis | Synonyms: acetylene, ethyne |
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| allegiance | (noun) the act of binding yourself (intellectually or emotionally) to a course of action | Synonyms: commitment, dedication, loyalty |
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| (noun) the loyalty that citizens owe to their country (or subjects to their sovereign) | Synonyms: fealty |
| allele | (noun) (genetics) either of a pair (or series) of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same character | Synonyms: allelomorph |
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| allemande | (noun) egg-thickened veloute | Synonyms: allemande sauce |
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| alliance | (noun) the act of forming an alliance or confederation | Synonyms: confederation |
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| (noun) a formal agreement establishing an association or alliance between nations or other groups to achieve a particular aim | - |
| (noun) an organization of people (or countries) involved in a pact or treaty | Synonyms: alignment, alinement, coalition |
| (noun) a connection based on kinship or marriage or common interest | Synonyms: bond |
| (noun) the state of being allied or confederated | Synonyms: confederation |
| allice | (noun) European shad | Synonyms: allice shad, allis, allis shad, Alosa alosa |
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| allophone | (noun) (linguistics) any of various acoustically different forms of the same phoneme | - |
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| allotrope | (noun) a structurally different form of an element | - |
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| allowance | (noun) the act of allowing | - |
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| (noun) a permissible difference; allowing some freedom to move within limits | Synonyms: leeway, margin, tolerance |
| (noun) an amount allowed or granted (as during a given period) | - |
| (noun) an amount added or deducted on the basis of qualifying circumstances | Synonyms: adjustment |
| (noun) a sum granted as reimbursement for expenses | - |
| (noun) a reserve fund created by a charge against profits in order to provide for changes in the value of a company's assets | Synonyms: allowance account, valuation account, valuation reserve |
| allspice | (noun) ground dried berrylike fruit of a West Indian allspice tree; suggesting combined flavors of cinnamon and nutmeg and cloves | - |
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| (noun) aromatic West Indian tree that produces allspice berries | Synonyms: allspice tree, Pimenta dioica, pimento tree |
| (noun) deciduous shrubs having aromatic bark; eastern China; southwestern and eastern United States | - |
| allure | (noun) the power to entice or attract through personal charm | Synonyms: allurement, temptingness |
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| almandine | (noun) a purple variety of the ruby spinel | - |
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| (noun) a deep red garnet consisting of iron aluminum silicate | Synonyms: almandite |
| almandite | (noun) a deep red garnet consisting of iron aluminum silicate | Synonyms: almandine |
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| aloe | (noun) succulent plants having rosettes of leaves usually with fiber like hemp and spikes of showy flowers; found chiefly in Africa | - |
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| altarpiece | (noun) a painted or carved screen placed above and behind an altar or communion table | Synonyms: reredos |
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| alternate | (noun) someone who takes the place of another person | Synonyms: replacement, surrogate |
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| alternative | (noun) one of a number of things from which only one can be chosen | Synonyms: choice, option |
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| altitude | (noun) elevation especially above sea level or above the earth's surface | Synonyms: height |
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| (noun) angular distance above the horizon (especially of a celestial object) | Synonyms: ALT, EL, elevation |
| (noun) the perpendicular distance from the base of a geometric figure to the opposite vertex (or side if parallel) | - |