WordNet sense 1 (any distinct time period in a sequence of events):

phase

WordNet sense 2 (a specific identifiable position in a continuum or series or especially in a process):

degree, level, point

WordNet sense 3 (a large coach-and-four formerly used to carry passengers and mail on regular routes between towns):

stagecoach

WordNet sense 4 (a small platform on a microscope where the specimen is mounted for examination):

microscope stage

WordNet sense 5 (perform (a play), especially on a stage):

present, represent, represent

WordNet sense 6 (plan, organize, and carry out (an event)):

arrange

WordNet sense 7 (a section or portion of a journey or course):

leg