/ Dictionary / Index D decidable: Meaning and Definition of Find definitions for: de•cid•a•ble Pronunciation: (di-sī'du-bul), [key] — adj. capable of being decided. (of an axiom, proposition, etc.) having the property that its consistency or inconsistency with the axioms of a given logical system is determinable. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. decibel decide Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language