automatic transmission[英][ˌɔ:təˈmætik trænzˈmiʃən][美][ˌɔtəˈmætɪk trænsˈmɪʃən]n.自动驾驶; 柯林斯词典 1N-UNCOUNT(汽车的)自动变速装置A car that is fitted with automatic transmission has a gear system in which the gears change automatically.