What is "naumachia"

Nauheim bath \Nauheim bath\, etc. [Webster 1913 Suppl.] naumachia \naumachia\ n. Same as naumachy.

n. (context nautical in Ancient Rome English) The recreation of sea battles in a river basin (or also a flooded amphitheater)

1. n. a naval spectacle; a mock sea battle put on by the ancient Romans [syn: naumachy]

2. [also: naumachiae (pl)]

The naumachia (in Latin naumachia, from the Ancient Greek ναυμαχία/naumachía, literally "naval combat") in the Ancient Roman word referred to both the staging of naval battles as mass entertainment and the basin (or more broadly, the complex) in which this took place.