/ Dictionary / Index D declivity: Meaning and Definition of Find definitions for: de•cliv•i•ty Pronunciation: (di-kliv'i-tē), [key] — pl. -ties. a downward slope, as of ground (opposed to acclivity). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: declivity (Thesaurus) declivitous declivous Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language