1. (n.) One step of a series for ascending or descending to a different level; -- commonly applied to those within a building.

2. (n.) A series of steps, as for passing from one story of a house to another; -- commonly used in the plural; but originally used in the singular only.

amount caliber compass cut degree doorstep extent footrest footstep grade height interval leap level mark measure notch nuance pas peg period pitch plane plateau point proportion range ratio reach remove rest riser round rundle rung scale scope shade shadow space spoke standard stave step step stool stepping-stone stint string tread