Naumáchia, naumáchiæ, pen. cor. f. g. Mart. A warre or battaile by sea.Naumachiam committere. Suet. To fight with ships on the sea. Naumachia. Sueton. The place where a battaile by sea is foughren.
Lewis and Short: Latin dictionary
naumăchĭa, ae, f., = naumaxi/a, the representation of a sea-fight, a mock seafight (pure Lat. navale proelium). I.Lit.: naumachiam commisit, Suet. Claud. 21: naumachiae spectaculum edere, id. Caes. 44: naumachiam exhibere, id. Ner. 12; Vell. 2, 56, 1; 2, 100, 2; Mart. Spect. 28, 12: voluptates naumachiae, Vopisc. Aur. 34, 6. —II.Transf., a place where mock seafights were exhibited: edidit et navale proelium in veteri naumachia, Suet. Tib. 7; 72; id. Dom. 5.