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Glossary of Horology - Time Keeping Terms
beginning with letter A
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a.m. Tweet Definition of a.m. Like Definition of a.m. on Facebook
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 Tweet Definition of analog watch Like Definition of analog watch on Facebook
noun (plural analog watches)
  1. US spelling of analogue watch
     
AST Tweet Definition of AST Like Definition of AST on Facebook
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 Tweet Definition of atomic clock Like Definition of atomic clock on Facebook
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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