colosseum

UK: /ˌkɒləˈsɪəm/ US: (kol′ə sē′əm)

Collins Concise English Dictionary © HarperCollins Publishers::

colosseum / ˌkɒləˈsɪəm/ noun

1. a variant spelling of coliseum

WordReference Random House Learner's Dictionary of American English © 2025

col•i•se•um /ˌkɑlɪˈsiəm/   n. [countable]

1. a stadium or large theater for sporting events, exhibitions, etc.

WordReference Random House Unabridged Dictionary of American English © 2025

Col•os•se•um  (kol′ə sē′əm), n. 

1. Antiquity an ancient amphitheater in Rome, begun a.d. c70 by Vespasian, having the form of an oval 617 by 512 ft. (188 by 156 m).
2. Antiquity (l.c.) coliseum.

• Greek kolossiaîos, equivalent. to koloss(ós) colossus + -iaios adjective, adjectival suffix
• Latin, noun, nominal use of neuter of colossēus gigantic

WordReference Random House Unabridged Dictionary of American English © 2025

col•i•se•um  (kol′i sē′əm), n. 

1. Also, colosseum. an amphitheater, stadium, large theater, or other special building for public meetings, sporting events, exhibitions, etc.
2. Antiquity (cap.) Colosseum.

• Medieval Latin Colisseum; see Colosseum
• 1700–10

Collins Concise English Dictionary © HarperCollins Publishers::

Colosseum / ˌkɒləˈsɪəm/ noun

1. an amphitheatre in Rome built about 75–80 ad

Collins Concise English Dictionary © HarperCollins Publishers::

coliseum / ˌkɒlɪˈsɪəm/, colosseum noun

1. a large building, such as a stadium or theatre, used for entertainments, sports, etc

Etymology: 18th Century: from Medieval Latin Colisseum, variant of Colosseum