/ Dictionary / Index C ctr.: Meaning and Definition of Find definitions for: ctr. Pronunciation: [key] center. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ctn cts. Related Content Daily Word Quiz: fresco Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language