/ Dictionary / Index C CNS: Meaning and Definition of Find definitions for: CNS Pronunciation: [key] central nervous system. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cns (Thesaurus) C-note Cnut 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