| axil | (noun) the upper angle between an axis and an offshoot such as a branch or leafstalk | - |
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| axilla | (noun) the hollow under the arm where it is joined to the shoulder | Synonyms: armpit, axillary cavity, axillary fossa |
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| axiology | (noun) the study of values and value judgments | - |
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| axiom | (noun) a saying that is widely accepted on its own merits | Synonyms: maxim |
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| (noun) (logic) a proposition that is not susceptible of proof or disproof; its truth is assumed to be self-evident | - |
| axis | (noun) the center around which something rotates | Synonyms: axis of rotation |
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| (noun) the 2nd cervical vertebra; serves as a pivot for turning the head | Synonyms: axis vertebra |
| (noun) a straight line through a body or figure that satisfies certain conditions | - |
| (noun) a group of countries in special alliance | Synonyms: bloc |
| (noun) the main stem or central part about which plant organs or plant parts such as branches are arranged | - |