noun:

1. A running board where passengers step to get on and off the bus.
2. One of a series of offsets, or parts, resembling the steps of stairs, as one of the series of parts of a cone pulley on which the belt runs.
3. A bearing in which the lower extremity of a spindle or a vertical shaft revolves.
4. A constant difference between consecutive values in a series.
5. A portable framework of stairs, much used indoors in reaching to a high position.
6. A distinct part of a process; stage; phase.
7. A stepsibling.
8. A rest, or one of a set of rests, for the foot in ascending or descending, as a stair, or a rung of a ladder.
9. Proceeding; measure; action; act.
10. A walk; passage.
11. A gait; manner of walking.
12. A small space or distance.
13. A framing in wood or iron which is intended to receive an upright shaft; specifically, a block of wood, or a solid platform upon the keelson, supporting the heel of the mast.
14. A change of position effected by a motion of translation.
15. An advance or movement made from one foot to the other; a pace.
16. The interval between two contiguous degrees of the scale.
17. The space passed over by one movement of the foot in walking or running.
18. A print of the foot; a footstep; a footprint; track.

verb:

1. To walk slowly, gravely, or resolutely.
2. To walk; to go on foot; especially, to walk a little distance.
3. To fix the foot of (a mast) in its step; to erect.
4. To set, as the foot.
5. To move the foot in walking; to advance or recede by raising and moving one of the feet to another resting place, or by moving both feet in succession.
6. To move mentally; to go in imagination.

name:

1. Initialism of Smart Traveler Enrollment Program.