
1) Ancient Roman theatre 2) Naumachy 3) Spectacle
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https://www.crosswordclues.com/clue/naumachia

1) Naumachy
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https://www.crosswordclues.com/clue/naumachia

The naumachia (in Latin naumachia, from the Ancient Greek ναυμαχία/naumachía, literally `naval combat`) in the Ancient Roman world referred to both the staging of naval battles as mass entertainment and the basin (or more broadly, the complex) in which this took place. == Early naumachia == The first known naumachia was given by Julius .....
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http://en.wikipedia.org/wiki/Naumachia

sea battle.
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http://s_van_dorst.tripod.com/Ancient_Warfare/Greece/greek_glossary.html

in ancient Rome, a mimic sea battle and the specially constructed basin in which such a battle sometimes took place. These entertainments also took ...
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http://www.britannica.com/eb/a-z/n/18

Imitation sea fight staged in a Roman amphitheatre, which was flooded for the occasion, or in an artificial basin (also called a naumachia). The combatants were prisoners of war or convicts, who...
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http://www.encyclo.co.uk/local/20688

A naval display, which included gladiatorial battles, presented in amphitheatres. These were staged from the time of Caesar onwards.
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http://www.encyclo.co.uk/visitor-contributions.php

naumachia 1. A naval spectacle; a mock sea battle put on by the ancient Romans. 2. An ancient Roman spectacle representing a naval battle which was used to entertain Romans in the circuses.
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http://www.wordinfo.info/words/index/info/view_unit/1373/2

a mock sea fight, given as a spectacle among the ancient Romans. · a place for presenting such spectacles.
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https://www.infoplease.com/dictionary/naumachia

(Latin: literally “navel combat,” staged sea-battles performed on water for mass entertainment purposes). Staged “group combat” that could involve thousands of combatants and full-sized ships of war ; due to scale of the spectacle, naumachiae were usually staged in lakes but smaller scaled-down, battles could fit into a Roman amphitheatre; ...
Found on
https://www.whitman.edu/theatre/theatretour/glossary/glossary.htm
No exact match found.