/ Dictionary / Index C counting number: Meaning and Definition of Find definitions for: count'ing num"ber Pronunciation: [key] — Math. Math. See(def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. counting house counting room Related Content Daily Word Quiz: cosmology Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language