/ Dictionary / Index C countably compact set: Meaning and Definition of Find definitions for: count'ably com'pact set' Pronunciation: [key] — Math. Math. a set for which every cover consisting of a countable number of sets has a subcover consisting of a finite number of sets. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. countably additive function countdown Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language