NOON Meaning of NOON in English ■ noun twelve o'clock in the day; midday.OriginOE nōn 'the ninth hour from sunrise, i.e. approximately 3 p.m.', from L. nona (hora) 'ninth hour'; cf. none 2 . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004