/ Dictionary / Index D differential coefficient: Meaning and Definition of Find definitions for: differen'tial coeffic'ient Pronunciation: [key] — Chiefly Brit. Chiefly Brit. derivative (def. 6). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. differential calculus differential compaction Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language