| authenticate | (verb) establish the authenticity of something | - |
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| author | (verb) be the author of | - |
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| authorise | (verb) grant authorization or clearance for | Synonyms: authorize, clear, pass |
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| (verb) give or delegate power or authority to | Synonyms: authorize, empower |
| authorize | (verb) grant authorization or clearance for | Synonyms: authorise, clear, pass |
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| (verb) give or delegate power or authority to | Synonyms: authorise, empower |
| autoclave | (verb) subject to the action of an autoclave | - |
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| autograph | (verb) mark with one's signature | Synonyms: inscribe |
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| automate | (verb) make automatic or control or operate automatically | Synonyms: automatise, automatize |
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| automatise | (verb) make automatic or control or operate automatically | Synonyms: automate, automatize |
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| (verb) turn into an automaton | Synonyms: automatize |
| automatize | (verb) make automatic or control or operate automatically | Synonyms: automate, automatise |
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| (verb) turn into an automaton | Synonyms: automatise |
| automobile | (verb) travel in an automobile | - |
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| autopsy | (verb) perform an autopsy on a dead body; do a post-mortem | - |
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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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