Definisi : n 1. response, reaksi: the chairman’s ~ to the proposal, reaksi pengerusi thdp usul itu; 2. opposition to change, reaksioner: the forces of ~ made reform almost impossible, kuasa-kuasa reaksioner menjadikan pembaharuan hampir tdk mungkin berlaku; 3. (chem) tindak balas: a chemical ~, tindak balas kimia. (Kamus Inggeris-Melayu Dewan)