stadium

noun6

1. •
   a big place built for games and races, with room for a crowd to sit and watch

   • He is going for a cricket match at the stadium.
2. •
   An Ancient Greek racecourse, especially, the Olympic course for foot races.
3. •
   (historical) Synonym of stadion, a Greek unit of length equivalent to about 185 m.

   • Dionysiodorus[…]sent a letter ad superos after he was dead, from the centre of the earth, to signify what distance the same centre was from the superficies of the same, viz. 42,000 stadiums […]. — 1624
4. •
   A kind of telemeter for measuring the distance of an object of known dimensions, by observing the angle it subtends.
5. •
   A graduated rod used to measure the distance of the place where it stands from an instrument having a telescope, by observing the number of the graduations of the rod that are seen between certain parallel wires (stadia wires) in the field of view of the telescope.
6. •
   A life stage of an organism.