Entry 1 sense Webster, 1913 Litigation /lĭtˌ-əg-āsh'-ən/ · Lit·i·ga·tion · IPA /ˌlɪtɪˈɡeɪ̯ʃən/ 01 n. The act or process of litigating; a suit at law; a judicial contest. 1. The act or process of litigating; a suit at law; a judicial contest.