prov·able \ˈprüvəbəl\adjective Etymology: Middle English, from Middle French, from Latin probabilis that which may be believed, from probare to test, prove + -abilis -able — more at prove : capable of being proved < practical truth provable to all men — Walter Bagehot > • prov·able·nessnoun-es • prov·ably\-blē\adverb