| aalii | (noun) a small Hawaiian tree with hard dark wood | - |
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| abelia | (noun) any of various deciduous or evergreen ornamental shrubs of the genus Abelia having opposite simple leaves and cymes of small white or pink or purplish flowers; Asia and Mexico | - |
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| abetalipoproteinemia | (noun) a rare inherited disorder of fat metabolism; characterized by severe deficiency of beta-lipoproteins and abnormal red blood cells (acanthocytes) and abnormally low cholesterol levels | - |
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| ability | (noun) the quality of being able to perform; a quality that permits or facilitates achievement or accomplishment | - |
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| (noun) possession of the qualities (especially mental qualities) required to do something or get something done | Synonyms: power |
| ablism | (noun) discrimination in favor of the able-bodied | Synonyms: able-bodiedism, able-bodism, ableism |
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| abnormality | (noun) behavior that breaches the rule or etiquette or custom or morality | Synonyms: irregularity |
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| (noun) marked strangeness as a consequence of being abnormal | Synonyms: freakishness |
| (noun) retardation sufficient to fall outside the normal range of intelligence | Synonyms: mental defectiveness |
| (noun) an abnormal physical condition resulting from defective genes or developmental deficiencies | Synonyms: abnormalcy |
| abolishment | (noun) the act of abolishing a system or practice or institution (especially abolishing slavery) | Synonyms: abolition |
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| abolition | (noun) the act of abolishing a system or practice or institution (especially abolishing slavery) | Synonyms: abolishment |
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| abolitionism | (noun) the doctrine that calls for the abolition of slavery | - |
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| abolitionist | (noun) a reformer who favors abolishing slavery | Synonyms: emancipationist |
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| aboulia | (noun) a loss of will power | Synonyms: abulia |
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| abulia | (noun) a loss of will power | Synonyms: aboulia |
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| acceptability | (noun) satisfactoriness by virtue of conforming to approved standards | Synonyms: acceptableness |
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| accessibility | (noun) the quality of being at hand when needed | Synonyms: availability, availableness, handiness |
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| (noun) the attribute of being easy to meet or deal with | Synonyms: approachability |
| acclimation | (noun) adaptation to a new climate (a new temperature or altitude or environment) | Synonyms: acclimatisation, acclimatization |
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| acclimatisation | (noun) adaptation to a new climate (a new temperature or altitude or environment) | Synonyms: acclimation, acclimatization |
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| acclimatization | (noun) adaptation to a new climate (a new temperature or altitude or environment) | Synonyms: acclimation, acclimatisation |
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| acclivity | (noun) an upward slope or grade (as in a road) | Synonyms: ascent, climb, raise, rise, upgrade |
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| accomplice | (noun) a person who joins with another in carrying out some plan (especially an unethical or illegal plan) | Synonyms: confederate |
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| accomplishment | (noun) the action of accomplishing something | Synonyms: achievement |
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| (noun) an ability that has been acquired by training | Synonyms: acquirement, acquisition, attainment, skill |
| accountability | (noun) responsibility to someone or for some activity | Synonyms: answerability, answerableness |
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| acephalia | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalism, acephaly |
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| acephalism | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalia, acephaly |
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| acetanilid | (noun) a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen) | Synonyms: acetanilide, phenylacetamide |
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| acetanilide | (noun) a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen) | Synonyms: acetanilid, phenylacetamide |
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| acetylcholine | (noun) a neurotransmitter that is a derivative of choline; released at the ends of nerve fibers in the somatic and parasympathetic nervous systems | - |
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| achievability | (noun) the state of being achievable | Synonyms: attainability, attainableness |
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| acholia | (noun) a condition in which little or no bile is secreted or the flow of bile into the digestive tract is obstructed | Synonyms: cholestasis |
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| achylia | (noun) absence of gastric juices (partial or complete) | Synonyms: achylia gastrica |
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| acromegalia | (noun) enlargement of bones of hands and feet and face; often accompanied by headache and muscle pain and emotional disturbances; caused by overproduction of growth hormone by the anterior pituitary gland (due to a tumor) | Synonyms: acromegaly |
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| acropolis | (noun) the citadel in ancient Greek towns | - |
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| acrylic | (noun) a synthetic fabric made from polyacrylonitrile | - |
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| (noun) used especially by artists | Synonyms: acrylic paint |
| (noun) a glassy thermoplastic; can be cast and molded or used in coatings and adhesives | Synonyms: acrylate resin, acrylic resin |
| (noun) polymerized from acrylonitrile | Synonyms: acrylic fiber |
| actinolite | (noun) a green mineral of the amphibole group; calcium magnesium iron silicate | - |
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| actualisation | (noun) making real or giving the appearance of reality | Synonyms: actualization, realisation, realization |
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| actuality | (noun) the state of actually existing objectively | - |
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| actualization | (noun) making real or giving the appearance of reality | Synonyms: actualisation, realisation, realization |
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| adactylia | (noun) congenital absence of fingers and/or toes | Synonyms: adactylism, adactyly |
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| adactylism | (noun) congenital absence of fingers and/or toes | Synonyms: adactylia, adactyly |
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| adaptability | (noun) the ability to change (or be changed) to fit changed circumstances | - |
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| admirability | (noun) admirable excellence | Synonyms: admirableness, wonderfulness |
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| admissibility | (noun) acceptability by virtue of being admissible | - |
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| adorability | (noun) extreme attractiveness | Synonyms: adorableness |
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| adrenaline | (noun) a catecholamine secreted by the adrenal medulla in response to stress (trade name Adrenalin); stimulates autonomic nerve action | Synonyms: Adrenalin, epinephrin, epinephrine |
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| advisability | (noun) the quality of being advisable | - |
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| aerialist | (noun) an acrobat who performs in the air (as on a rope or trapeze) | - |
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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 |
| aerolite | (noun) a stony meteorite consisting of silicate minerals | - |
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| affability | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affableness, amiability, amiableness, bonhomie, geniality |
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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 | - |
| 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 |
| 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 | - |
| afterlife | (noun) life after death | Synonyms: hereafter |
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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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| agility | (noun) the gracefulness of a person or animal that is quick and nimble | Synonyms: legerity, lightness, lightsomeness, nimbleness |
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| agreeability | (noun) a temperamental disposition to be agreeable | Synonyms: agreeableness |
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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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| aioli | (noun) garlic mayonnaise | Synonyms: aioli sauce, garlic sauce |
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| 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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| alalia | (noun) paralysis of the vocal cords resulting in an inability to speak | - |
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| alcoholic | (noun) a person who drinks alcohol to excess habitually | Synonyms: alky, boozer, dipsomaniac, lush, soaker, souse |
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| alcoholism | (noun) an intense persistent desire to drink alcoholic beverages to excess | Synonyms: dipsomania, potomania |
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| (noun) habitual intoxication; prolonged and excessive intake of alcoholic drinks leading to a breakdown in health and an addiction to alcohol such that abrupt deprivation leads to severe withdrawal symptoms | Synonyms: alcohol addiction, drunkenness, inebriation |
| algophilia | (noun) sexual pleasure derived from inflicting or experiencing pain | Synonyms: algolagnia |
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| alhamdulilah | (noun) An expression meaning 'praise God' in Arabic | - |
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| alias | (noun) a name that has been assumed | Synonyms: assumed name, false name |
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| alibi | (noun) (law) a defense by an accused person purporting to show that he or she could not have committed the crime in question | - |
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| (noun) a defense of some offensive behavior or some failure to keep a promise etc. | Synonyms: exculpation, excuse, self-justification |
| alidad | (noun) surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles | Synonyms: alidade |
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| (noun) surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments | Synonyms: alidade |
| 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 |
| alien | (noun) a person who comes from a foreign country; someone who does not owe allegiance to your country | Synonyms: foreigner, noncitizen, outlander |
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| (noun) anyone who does not belong in the environment in which they are found | Synonyms: stranger, unknown |
| (noun) a form of life assumed to exist outside the Earth or its atmosphere | Synonyms: extraterrestrial, extraterrestrial being |
| alienage | (noun) the quality of being alien | Synonyms: alienism |
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| alienation | (noun) the action of alienating; the action of causing to become unfriendly | - |
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| (noun) (law) the voluntary and absolute transfer of title and possession of real property from one person to another | - |
| (noun) the feeling of being alienated from other people | Synonyms: disaffection, estrangement |
| (noun) separation resulting from hostility | Synonyms: estrangement |
| alienator | (noun) an unpleasant person who causes friendly people to become indifferent or unfriendly or hostile | - |
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| alienee | (noun) someone to whom the title of property is transferred | Synonyms: grantee |
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| alienism | (noun) the quality of being alien | Synonyms: alienage |
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| (noun) an obsolete term for the study and treatment of mental illness | - |
| alienist | (noun) a psychiatrist and specialist in the legal aspects of mental illness | - |
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| alienor | (noun) someone from whom the title of property is transferred | - |
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| alignment | (noun) the act of adjusting or aligning the parts of a device in relation to each other | - |
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| (noun) the spatial property possessed by an arrangement or position of things in a straight line or in parallel lines | - |
| (noun) (astronomy) apparent meeting or passing of two or more celestial bodies in the same degree of the zodiac | Synonyms: conjunction |
| (noun) an organization of people (or countries) involved in a pact or treaty | Synonyms: alinement, alliance, coalition |
| alikeness | (noun) similarity in appearance or character or nature between persons or things | Synonyms: likeness, similitude |
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| aliment | (noun) a source of materials to nourish the body | Synonyms: alimentation, nourishment, nutriment, nutrition, sustenance, victuals |
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| alimentation | (noun) the act of supplying food and nourishment | Synonyms: feeding |
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| (noun) a source of materials to nourish the body | Synonyms: aliment, nourishment, nutriment, nutrition, sustenance, victuals |
| alimony | (noun) court-ordered support paid by one spouse to another after they are separated | Synonyms: maintenance |
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| alinement | (noun) an organization of people (or countries) involved in a pact or treaty | Synonyms: alignment, alliance, coalition |
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| aliquant | (noun) an integer that is not an exact divisor of some quantity | Synonyms: aliquant part |
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| aliquot | (noun) an integer that is an exact divisor of some quantity | Synonyms: aliquot part |
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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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| 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 |
| aliyah | (noun) (Judaism) immigration of Jews to Israel | - |
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| (noun) (Judaism) the honor of being called up to the reading desk in the synagogue to read from the Torah | - |
| alizarin | (noun) an orange-red crystalline compound used in making red pigments and in dyeing | Synonyms: alizarine |
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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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| alkali | (noun) any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water | Synonyms: base |
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| (noun) a mixture of soluble salts found in arid soils and some bodies of water; detrimental to agriculture | - |
| alkalimetry | (noun) volumetric analysis using standard solutions of alkali to measure the amount of acid present | - |
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| alkalinity | (noun) pH values above 7 | - |
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| alkalinuria | (noun) a condition in which the urine (which is normally slightly acidic) is alkaline | Synonyms: alkaluria |
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| alkaliser | (noun) an agent that counteracts or neutralizes acidity (especially in the stomach) | Synonyms: alkalizer, antacid, antiacid, gastric antacid |
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| alkalizer | (noun) an agent that counteracts or neutralizes acidity (especially in the stomach) | Synonyms: alkaliser, antacid, antiacid, gastric antacid |
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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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| allies | (noun) an alliance of nations joining together to fight a common enemy | - |
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| alligator | (noun) either of two amphibious reptiles related to crocodiles but with shorter broader snouts | Synonyms: gator |
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| (noun) leather made from alligator's hide | - |