| a.m. |
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abbreviation
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before noon (used after a time to indicate it is between midnight and noon, i.e., in the morning)
- ad modum (less commonly used)
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| analog watch |
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noun (pluralanalog watches)
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US spelling of analogue watch
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| AST |
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initialism
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(medicine) aspartate transaminase
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(computing) abstract syntax tree
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(aviation) Advanced Supersonic Transport
- Atlantic Standard Time
- Alaskan Standard Time
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| atomic clock |
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noun- An extremely accurate reference clock whose operation is based on an atomic process, typically the frequency of electromagnetic radiation associated with a specified energy-level transition in an element such as cesium.
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