| automysophobia | (noun) a morbid fear of being dirty | - |
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| autonomic | (adjective) relating to or controlled by the autonomic nervous system | - |
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| autonomous | (adjective) (of political bodies) not controlled by outside forces | Synonyms: independent, self-governing, sovereign |
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| (adjective) (of persons) free from external control and constraint in e.g. action and judgment | Synonyms: self-directed, self-reliant |
| (adjective) existing as an independent entity | - |
| autonomy | (noun) immunity from arbitrary exercise of authority: political independence | Synonyms: liberty |
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| (noun) personal independence | Synonyms: self-direction, self-reliance, self-sufficiency |
| autophyte | (noun) plant capable of synthesizing its own food from simple organic substances | Synonyms: autophytic plant, autotroph, autotrophic organism |
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| autophytic | (adjective) of or relating to organisms (as green plants) that can make complex organic nutritive compounds from simple inorganic sources by photosynthesis | Synonyms: autotrophic |
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| autopilot | (noun) a navigational device that automatically keeps ships or planes or spacecraft on a steady course | Synonyms: automatic pilot, robot pilot |
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| (noun) a cognitive state in which you act without self-awareness | Synonyms: automatic pilot |
| autoplastic | (adjective) of or relating to or involved in autoplasty | - |
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| autoplasty | (noun) surgical repair by using tissue from another part of the patient's own body | - |
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| (noun) tissue that is taken from one site and grafted to another site on the same person | Synonyms: autograft |
| autopsy | (noun) an examination and dissection of a dead body to determine cause of death or the changes produced by disease | Synonyms: necropsy, PM, post-mortem, post-mortem examination, postmortem, postmortem examination |
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| (verb) perform an autopsy on a dead body; do a post-mortem | - |
| autoradiograph | (noun) a radiogram produced by radiation emitted by the specimen being photographed | - |
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| autoradiographic | (adjective) of or relating to or produced by autoradiography | - |
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| autoradiography | (noun) producing a radiograph by means of the radiation emitted from the specimen being photographed | - |
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| autoregulation | (noun) (physiology) processes that maintain a generally constant physiological state in a cell or organism | - |
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| autosemantic | (adjective) of a word or phrase meaningful in isolation, independent of context | - |
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| autosexing | (noun) (especially of domestic fowl) breeding to reveal differential sex characteristics at hatching | - |
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| autosomal | (adjective) of or relating to an autosome | - |
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| autosome | (noun) any chromosome that is not a sex chromosome; appear in pairs in body cells but as single chromosomes in spermatozoa | Synonyms: somatic chromosome |
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| autostereotype | (noun) the standardized mental picture held in common by members of a cultural group depicting an oversimplified image of themselves and their behaviour. | - |
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| autostrada | (noun) an expressway in an Italian-speaking country | - |
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| autosuggestion | (noun) a system for self-improvement developed by Emile Coue which was popular in the 1920s and 1930s | Synonyms: auto-suggestion, self-suggestion |
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| autotelic | (adjective) of or relating to or believing in autotelism | - |
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| autotelism | (noun) belief that a work of art is an end in itself or its own justification | - |
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| autotomic | (adjective) of or relating to autotomy | - |
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| autotomise | (verb) cause a body part to undergo autotomy | Synonyms: autotomize |
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| autotomize | (verb) cause a body part to undergo autotomy | Synonyms: autotomise |
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| autotomy | (noun) spontaneous removal or casting off of a body part (as the tail of a lizard or claw of a lobster) especially when the organism is injured or under attack | - |
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| autotroph | (noun) plant capable of synthesizing its own food from simple organic substances | Synonyms: autophyte, autophytic plant, autotrophic organism |
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| autotrophic | (adjective) of or relating to organisms (as green plants) that can make complex organic nutritive compounds from simple inorganic sources by photosynthesis | Synonyms: autophytic |
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| autotype | (noun) an exact copy or reproduction | Synonyms: facsimile |
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| (noun) process for producing permanent prints in a carbon pigment | Synonyms: autotypy |
| autotypic | (adjective) of or relating to autotypy | - |
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| autotypy | (noun) process for producing permanent prints in a carbon pigment | Synonyms: autotype |
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| autumn | (noun) the season when the leaves fall from the trees | Synonyms: fall |
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| autumnal | (adjective) of or characteristic of or occurring in autumn | - |
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| (adjective) characteristic of late maturity verging on decline | - |
| auxesis | (noun) growth from increase in cell size without cell division | - |
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| auxetic | (adjective) of or relating to growth by auxesis | - |
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| auxiliary | (adjective) functioning in a supporting capacity | Synonyms: subsidiary, supplemental, supplementary |
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| (adjective) furnishing added support | Synonyms: accessory, adjunct, adjuvant, ancillary, appurtenant |
| (noun) someone who acts as assistant | Synonyms: aide |
| auxin | (noun) a plant hormone that promotes root formation and bud growth | - |
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| auxinic | (adjective) relating to or containing auxins | - |
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