Meaning of decidable

de•cid•a•ble

Pronunciation: (di-sī'du-bul), [key]
— adj.
  1. capable of being decided.
  2. (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.