Source : Webster's Revised Unabridged Dictionary (1913)

Noonday \Noon"day`\, n.
   Midday; twelve o'clock in the day; noon.

Noonday \Noon"day`\, a.
   Of or pertaining to midday; meridional; as, the noonday heat.
   ``Noonday walks.'' --Addison.

Source : WordNet®

noonday
     n : the middle of the day [syn: {noon}, {twelve noon}, {high
         noon}, {midday}, {noontide}]