coliseum Meaning, Definition & Usage

  1. noun an oval large stadium with tiers of seats; an arena in which contests and spectacles are held
    amphitheatre; amphitheater.

WordNet

Col`i*se"um noun
Etymology
NL. (cf. It. coliseo, colosseo), fr. L. colosseus colossal, fr. colossus a colossus. See Colossus, and cf. Colosseum.
Definitions
  1. The amphitheater of Vespasian at Rome, the largest in the world. Written also Colosseum.

Webster 1913