LATIN DICTIONARYLexicon Latīnum
proper noun · femininefirst declension

Allia

Allia f sg (genitive Alliae)
Classical[ˈal.li.a]Ecclesiastical[ˈal.li.a]

Meaning

  1. femininesingulara river in Latium, famous for its battle

Declension

declension
formsingularplural
nominativeAllia—
genitiveAlliae—
dativeAlliae—
accusativeAlliam—
ablativeAlliā—
vocativeAllia—

Allĭa (more correct than Alĭa; cf. Wagner, Orthogr. Vergil. p. 415 sq.), ae, f.,
I. a little river eleven miles northwards from Rome, near Crustumerium, in the country of the Sabines, passing through a wide plain (cf. Mann. Ital. 1, 520; Müll. Roms Camp. 1, 138; 141 sq.); it was made memorable by the terrible defeat of the Romans by the Gauls A. U. C. 365, XV. Kal. Sextil. (18 July).—Hence, Alliensis, e, adj., of or pertaining to Allia: dies, of this battle, considered ever after as a dies nefastus, Liv. 5, 37-39; 6, 1; Cic. Att. 9, 5; Verg. A. 7, 717; Luc. 7, 408; Suet. Vit. 11; cf. Paul. ex Fest. p. 7 Müll.

Origins

From the Proto-Indo-European root *h₁ey- common in many other river names, such as the Aller in Germany, Alaunus in some Celtic sites, and the Ille in Brittany. See also French aller (“to go”), German eilen (“to hasten, hurry”), Swedish ila.

In the Academy Smith's classical dictionaries

Quick answers

What does Allia mean in Latin?
Allia, a proper noun, means “a river in Latium, famous for its battle”.
What is the genitive of Allia?
The genitive singular is Alliae. Allia is feminine, first declension.
How do you pronounce Allia?
In classical Latin, [ˈal.li.a]; in ecclesiastical (church) Latin, [ˈal.li.a].