The middle of the day; midday; the time when the sun is in the meridian; twelve o'clock in the daytime
Noon means happening or appearing in the middle part of the day. The noon sun was fierce He expected the transfer to go through by today's noon deadline. = midday
Noon is twelve o'clock in the middle of the day. The long day of meetings started at noon Our branches are open from 9am to 5pm during the week and until 12 noon on Saturdays. see also high noon = midday
morning, noon, and night: see morning. 12 o'clock in the daytime = midday at/before/by noon