| auscultation | (noun) listening to sounds within the body (usually with a stethoscope) | - |
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| auspex | (noun) (ancient Rome) a religious official who interpreted omens to guide public policy | Synonyms: augur |
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| auspice | (noun) a favorable omen | - |
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| auspices | (noun) kindly endorsement and guidance | Synonyms: aegis, protection |
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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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| 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 | (noun) the basic unit of money in Argentina; equal to 100 centavos | - |
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| australopithecine | (noun) any of several extinct humanlike bipedal primates with relatively small brains of the genus Australopithecus; from 1 to 4 million years ago | - |
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