noun
: the ratio of the angular speed of the initial or driving member of a gear train or equivalent mechanism to that of the final or driven member ; specifically : the number of engine revolutions per revolution of the rear wheels of an automobile
noun
: the ratio of the angular speed of the initial or driving member of a gear train or equivalent mechanism to that of the final or driven member ; specifically : the number of engine revolutions per revolution of the rear wheels of an automobile
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012