ac·count·a·ble / əˈkountəbəl/ • adj. 1. (of a person, organization, or institution) required or expected to justify actions or decisions; responsible: a government accountable to its citizens parents held accountable for their children's actions. 2. explicable; understandable: the wry dialogue is not accountable until the third chapter. DERIVATIVES: ac·count·a·bil·i·ty / əˌkountəˈbilitē/ n. ac·count·a·bly / -blē/ adv.