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Adverb: on the dot
Usage: informal
  1. Just as it should be
    "'on the dot, my lord,' he said";
    - precisely, exactly, on the nose [informal], on the button [informal]
Adjective: on the dot
  1. Acting, arriving or performed exactly at the time appointed
    "she expected guests to be on the dot at meals";
    - punctual, on time

See also: prompt, timely