Midday mid'-da (machatsith ha-yom, tsohorayim; hemera mese): The Hebrew machatsith ha-yom (Nehemiah 8:3) and the Greek hemeras meses (Acts 26:13) are strictly the middle of the day, but the Hebrew tshorayim is a dual form from tsohar, meaning "light," hence, light or brightness, i.e. the brightest part of the day (1 Kings 18:29).
See NOON.