/ Dictionary / Index C class mark: Meaning and Definition of Find definitions for: class' mark" Pronunciation: [key] — Statistics. Statistics. the midpoint of a class interval. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. classless classmate Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language