[tred-mil] 
| 1. | an apparatus for producing rotary motion by the weight of people or animals, treading on a succession of moving steps or a belt that forms a kind of continuous path, as around the periphery of a pair of horizontal cylinders. |
| 2. | an exercise machine that allows the user to walk or run in place, usually on a continuous moving belt. |
| 3. | any monotonous, wearisome routine in which there is little or no satisfactory progress. |
| tread·mill (trěd'mĭl') n.
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