/ Dictionary / Index D diagenesis: Meaning and Definition of Find definitions for: di•a•gen•e•sis Pronunciation: (dī"u-jen'u-sis), [key] — n. Geol. the physical and chemical changes occurring in sediments between the times of deposition and solidification. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diag. diageotropic Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language