automatic transmission
noun🔊/ˌɔːtəmætɪk trænzˈmɪʃn/
🔊/ˌɔːtəmætɪk trænzˈmɪʃn/
[uncountable, countable]a system in a vehicle that changes the gears itself so that the driver does not have to （机动车的）自动变速器 a car with automatic transmission 自动变速器的汽车