—adj. 1. of, pertaining to, characterized by, or of the nature of a revolution, or a sudden, complete, or marked change: a revolutionary junta. 2. radically new or innovative; outside or beyond established procedure, principles, etc.: a revolutionary discovery. 3. (cap.) of or pertaining to the American Revolution or to the period contemporaneous with it in U.S. history: Revolutionary heroes; Revolutionary weapons. 4. revolving.