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Glossary of Horology - Time Keeping Terms
beginning with letter A
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a.m.
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abbreviation
  1. before noon (used after a time to indicate it is between midnight and noon, i.e., in the morning)
  2. ad modum (less commonly used)
analog watch
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noun (plural analog watches)
  1. US spelling of analogue watch
AST
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initialism
  1. (medicine) aspartate transaminase
  2. (computing) abstract syntax tree
  3. (aviation) Advanced Supersonic Transport
  4. Atlantic Standard Time
  5. Alaskan Standard Time
atomic clock
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noun
  1. 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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