Noon n.
  1. The middle of the day; midday; the time when the sun is in the meridian; twelve o'clock in the daytime.
  2. Hence, the highest point; culmination.
     In the very noon of that brilliant life which was destined to be so soon, and so fatally, overshadowed.   --Motley.
  High noon, the exact meridian; midday.
  Noon of night, midnight. [Poetic] --Dryden.