Entry 5 senses · 4 variants Webster, 1913 Noon /(nōn)/ · IPA /nun/ a. n. a. v. i. 01 a. No. See the Note under No. 1. No. See the Note under No.[Obs.] See: No 02 n. The middle of the day; midday; the time when the sun is in the meridian; twelve o'clock in the daytime. 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. Phrases & compounds High noon — the exact meridian; midday. Noon of night — midnight. 03 a. Belonging to midday; occurring at midday; meridional. 1. Belonging to midday; occurring at midday; meridional. 04 v. i. To take rest and refreshment at noon. 1. To take rest and refreshment at noon.