stadium

A large, usually open structure for sports events with tiered seating for spectators.

A course on which foot races were held in ancient Greece, usually semicircular and having tiers of seats for spectators.

An ancient Greek measure of distance, based on the length of such a course and equal to about 185 meters (607 feet).

A stage or period in the course of a disease.

A stage in the development or life history of an organism.

In zoology, same as stage, 9.

In entomology, same as instar.

A Greek itinerary unit, originally the distance between successive stations of the shouters and runners employed to estimate distances.

Hence A Greek course for foot-racos, disposed on a level, with sloping banks or tiers of seats for spectators rising along its two sides and at one end, which was typically of semicircular plan.

A stage; period; in medicine, a stage or period of a disease, especially of an intermittent disease.