Pronunciation: (kā"pu-bil'i-tē),[key] —n., —pl.-ties. 1. the quality of being capable; capacity; ability: His capability was unquestionable. 2. the ability to undergo or be affected by a given treatment or action: the capability of glass in resisting heat. 3. Usually, capabilities. qualities, abilities, features, etc., that can be used or developed; potential: Though dilapidated, the house has great capabilities.