A point, period, or step in a process or development. A raised floor or platform, typically in a theater, on which actors, entertainers, or speakers perform. A floor or level of a building or structure. (in chronostratigraphy) a range of strata corresponding to an age in time, forming a subdivision of a series. Present a performance of (a play or other show). Diagnose or classify (a disease or patient) as having reached a particular stage in the expected progression of the disease.