Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: dott 'top of a spot on the skin'

dot

1 noun
     
dot1 S2 [countable]
1 a small round mark or spot:
a pattern of dots
2

on the dot

informal exactly on time or at a particular time:
I'll be there on the dot.
at three o'clock/seven thirty etc on the dot (=at exactly 3:00/7:30 etc)
Mr Green arrived at six on the dot.
3 something that looks like a small spot because it is so far away:
The plane was just a dot on the horizon.
4 a short sound or flash of light used when sending messages by Morse code [↪ dash]

➔ the year dot

at year (13)
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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