Definition of “midday” - Learner’s Dictionary

midday

noun [ U ] uk us /ˌmɪdˈdeɪ/

A2 12 o'clock in the middle of the day, or the period around this time:

I usually go for a walk at midday.
the heat of the midday sun

(Definition of “midday” from the Cambridge Learner's Dictionary © Cambridge University Press)