having sufficient power, skill, or resources to do something. having the freedom or opportunity to do something. having a quality or nature that makes something possible. susceptible to some action or treatment. abler ˈā-b(ə-)lər;ablest ˈā-b(ə-)ləst: marked by intelligence, knowledge, skill, or competence. capable of, fit for, or worthy of (being so acted upon or toward) —chiefly in adjectives derived from verbs. tending, given, or liable to.