Entry 1 sense Webster, 1913 Banishment /băn'-ĭsh-mənt/ · Ban·ish·ment · IPA /ˈbænɪʃmənt/ 01 n. The act of banishing, or the state of being banished. 1. The act of banishing, or the state of being banished. “He secured himself by the banishment of his enemies.” — Johnson. “Round the wide world in banishment we roam.” — Dryden. Syn. Expatriation; ostracism; expulsion; proscription; exile; outlawry.