/ Dictionary / Index C C and I: Meaning and Definition of Find definitions for: C&I Pronunciation: [key] commerce and industry. commercial and industrial. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. C. and F. Candia 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