'noontime' originates from Middle English, specifically the word 'none,' which referred to the ninth hour of the day, around 3 PM, but later shifted to mean midday.

'none' transformed into the Old English word 'nōn,' and eventually became the modern English word 'noon' through Middle English.

Initially, it meant 'ninth hour of the day,' but over time it evolved into its current meaning of 'midday.'