| avian | (adjective) pertaining to or characteristic of birds | - |
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| avianise | (verb) to modify microorganisms by repeated culture in the developing chick embryo | Synonyms: avianize |
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| avianize | (verb) to modify microorganisms by repeated culture in the developing chick embryo | Synonyms: avianise |
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| aviary | (noun) a building where birds are kept | Synonyms: bird sanctuary, volary |
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| aviate | (verb) operate an airplane | Synonyms: fly, pilot |
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| aviation | (noun) travel via aircraft | Synonyms: air, air travel |
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| (noun) the art of operating aircraft | Synonyms: airmanship |
| (noun) the aggregation of a country's military aircraft | Synonyms: air power |
| (noun) the operation of aircraft to provide transportation | - |
| aviator | (noun) someone who operates an aircraft | Synonyms: aeronaut, flier, flyer |
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| aviatress | (noun) a woman aviator | Synonyms: airwoman, aviatrix |
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| aviatrix | (noun) a woman aviator | Synonyms: airwoman, aviatress |
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| avid | (adjective) (often followed by `for') ardently or excessively desirous | Synonyms: devouring, esurient, greedy |
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| (adjective) marked by active interest and enthusiasm | Synonyms: zealous |
| avidity | (noun) a positive feeling of wanting to push ahead with something | Synonyms: avidness, eagerness, keenness |
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| avidly | (adverb) in an avid manner | - |
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| avidness | (noun) a positive feeling of wanting to push ahead with something | Synonyms: avidity, eagerness, keenness |
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| avifauna | (noun) the birds of a particular region or period | - |
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| avifaunal | (adjective) of or relating to birds of a particular region or period | Synonyms: avifaunistic |
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| avifaunistic | (adjective) of or relating to birds of a particular region or period | Synonyms: avifaunal |
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| avionic | (adjective) of or relating to avionics | - |
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| avionics | (noun) science and technology of electronic systems and devices for aeronautics and astronautics | - |
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| avirulent | (adjective) not virulent; unable to produce disease | - |
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| avitaminosis | (noun) any of several diseases caused by deficiency of one or more vitamins | Synonyms: hypovitaminosis |
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| avitaminotic | (adjective) of or relating to or characteristic of avitaminosis | - |
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