LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Aternius

Aternius m sg (genitive Aterniī or Aternī)
Classical[aˈtɛr.ni.ʊs]Ecclesiastical[aˈtɛr.ni.us]

Meaning

  1. masculinesingulara Roman nomen gentile, gens or "family name" famously held by
  2. masculinesingularAulus Aternius Varus, a Roman consul

Declension

declension
formsingularplural
nominativeAternius—
genitiveAterniī
Aternī		—
dativeAterniō—
accusativeAternium—
ablativeAterniō—
vocativeAternī—

Āternĭus, ii, m.,
I. a Roman family name: Aternius Fontinalis, a consul A. U. C. 300, Cic. Rep. 2, 35, 60 Mai; from him proceeded the Lex Aternia (or Tarpeia; cf. Fest. s. v. peculatus, p. 237 Müll.): de multā, Gell. 11, 1, 2.

Quick answers

What does Aternius mean in Latin?
Aternius, a proper noun, means “a Roman nomen gentile, gens or "family name" famously held by”.
What is the genitive of Aternius?
The genitive singular is Aterniī. Aternius is masculine, second declension.
How do you pronounce Aternius?
In classical Latin, [aˈtɛr.ni.ʊs]; in ecclesiastical (church) Latin, [aˈtɛr.ni.us].