GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Timer (?), n.
   1. A timekeeper; especially, a watch by which small intervals of time can be measured; a kind of stop watch. It is used for timing the speed of horses, machinery, etc.
   
   [1913 Webster]
   
   
   2. (Internal-combustion Engines) In electric ignition, an adjustable device for automatically timing the spark.
   
   [Webster 1913 Suppl.]