Midday refers to the hour of 12:00 at the middle of the day, also known as noon, or to the time centering around noon usually referring to between 11-1.
Midday refers to the hour of 12:00 at the middle of the day or to the time-1. This time is centering around noon-1. This noon is usually referring to between 11-1. The middle of the day is also known as noon.