1. (n.) Midday; twelve o'clock in the day; noon.

2. (a.) of or pertaining to midday; meridional; as, the noonday heat.

acme apex apogee brow cap climax cloud nine crest crown culmen culmination edge eight bells extreme limit extremity heaven heavens height highest pitch highest point limit maximum meridian meridiem midday mountaintop ne plus ultra no place higher noon noonday nooning noonlight noontide noontime peak pinnacle pitch point pole ridge seventh heaven sky spire summit tip tip-top top upmost upper extremity uppermost utmost vertex very top zenith