Treadmill - definition of treadmill by The Free Dictionary
tread·mill (trĕd′mĭl′) n. 1. A wheel with steps on which a person treads, used to power machinery. 2. An exercise device consisting of a continuous moving belt on which a person or animal can walk or run while remaining in one place. 3. A monotonous routine or set of tasks. American Heritage® Dictionary of the English Language, Fifth Edition ...