| auscultate | (verb) examine by auscultation | - |
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| auscultation | (noun) listening to sounds within the body (usually with a stethoscope) | - |
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| auscultatory | (adjective) of or relating to auscultation | - |
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| auspex | (noun) (ancient Rome) a religious official who interpreted omens to guide public policy | Synonyms: augur |
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| auspicate | (verb) commence in a manner calculated to bring good luck | - |
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| (verb) indicate, as with a sign or an omen | Synonyms: augur, betoken, bode, forecast, foreshadow, foretell, omen, portend, predict, prefigure, presage, prognosticate |
| auspice | (noun) a favorable omen | - |
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| auspices | (noun) kindly endorsement and guidance | Synonyms: aegis, protection |
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| auspicious | (adjective) auguring favorable circumstances and good luck | - |
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| auspiciously | (adverb) in an auspicious manner | Synonyms: propitiously |
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| auspiciousness | (noun) the favorable quality of strongly indicating a successful result | Synonyms: propitiousness |
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| austenite | (noun) a solid solution of ferric carbide or carbon in iron; cools to form pearlite or martensite | - |
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| austenitic | (adjective) composed of austenite | - |
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| austere | (adjective) practicing great self-denial | Synonyms: ascetic, ascetical, spartan |
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| (adjective) of a stern or strict bearing or demeanor; forbidding in aspect | Synonyms: stern |
| (adjective) severely simple | Synonyms: severe, stark, stern |
| austerely | (adverb) in an austere fashion | - |
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| austereness | (noun) extreme plainness | Synonyms: severeness, severity |
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| austerity | (noun) the trait of great self-denial (especially refraining from worldly pleasures) | Synonyms: asceticism, nonindulgence |
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| austral | (adjective) of the south or coming from the south | - |
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| (noun) the basic unit of money in Argentina; equal to 100 centavos | - |
| australopithecine | (adjective) of or belonging to the hominid genus Australopithecus | - |
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| (noun) any of several extinct humanlike bipedal primates with relatively small brains of the genus Australopithecus; from 1 to 4 million years ago | - |