a.m. |
| abbreviation
- before noon (used after a time to indicate it is between midnight and noon, i.e., in the morning)
- ad modum (less commonly used)
|
|
analog watch |
| noun (plural analog watches)
- US spelling of analogue watch
|
AST |
| initialism
- (medicine) aspartate transaminase
- (computing) abstract syntax tree
- (aviation) Advanced Supersonic Transport
- Atlantic Standard Time
- Alaskan Standard Time
|
atomic clock |
| 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.
|