ETYM as. middaeg. Related to Mid, and Day.
The middle part of the day; noon.
The middle of the day.

ETYM as. non, orig., the ninth hour, from Latin nona (sc. hora) the ninth hour, then applied to the church services (called nones) at that hour, the time of which was afterwards changed to noon. Related to Nine, Nones, Nunchion.
The middle of the day; SYN. twelve noon, high noon, midday, noonday, noontide.