/ Dictionary / Index M mean noon: Meaning and Definition of Find definitions for: mean' noon' Pronunciation: [key] the moment when the mean sun's center crosses the meridian. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. meanness mean planet Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language