Noon

adj. of noontime; occurring at twelve o'clock in the daytime

n. midday; 12:00 P.M., twelve o'clock in the daytime

Noon is 12:00 at midday. Contrary to popular belief, it is not the moment when the sun crosses the meridian. The sun does cross the meridian at noon, apparent solar time, but we live by civil time (which is either Standard Time or Daylight Saving Time depending on the time of year and local laws) which is not the same as apparent solar time. Midday is also used as a synonym for noon, although this may also be a more general term to mean around noon, or very early afternoon.
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Noun
1. the middle of the day
(synonym) twelve noon, high noon, midday, noonday, noontide
(hypernym) hour, time of day
(part-holonym) day, twenty-four hours, solar day, mean solar day

(v. i.)
To take rest and refreshment at noon.
  

(n.)
The middle of the day; midday; the time when the sun is in the meridian; twelve o'clock in the daytime.
  

(n.)
Hence, the highest point; culmination.
  

(a.)
No. See the Note under No.
  

(a.)
Belonging to midday; occurring at midday; meridional.
  

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