Definition of "stadium"

stadium

/ˈsteɪ.di.əm/

noun
plural stadiums or stadia
1. A venue where sporting events are held.
  Quotations
  In a convulsion that has caught many in Brazil and beyond by surprise, waves of protesters denounced their leaders for dedicating so many resources to cultivating Brazil’s global image by building stadiums for international events, when basic services like education and health care remain woefully inadequate.
  2013 June 18, Simon Romero, “Protests Widen as Brazilians Chide Leaders”, in New York Times‎
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.
  Quotations
  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, Democritus Junior [pseudonym; Robert Burton], The Anatomy of Melancholy: […], 2nd edition, Oxford, Oxfordshire: Printed by John Lichfield and James Short, for Henry Cripps, partition 2, section 2, member 3, page 245
4. A kind of telemeter for measuring the distance of an object of known dimensions, by observing the angle it subtends.
5. (surveying) 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. (biology) A life stage of an organism.