LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Nōnius

Nōnius m sg (genitive Nōniī or Nōnī)
Classical[ˈnoː.ni.ʊs]Ecclesiastical[ˈnɔː.ni.us]

Meaning

  1. a Roman nomen gentile, gens or "family name" famously held by
  2. Nonius Marcellus, a Roman grammarian

Declension

declension
formsingularplural
nominativeNōnius—
genitiveNōniī
Nōnī		—
dativeNōniō—
accusativeNōnium—
ablativeNōniō—
vocativeNōnī—

Nōnĭus, a,
I. the name of a Roman gens. So M. Nonius Suffenas, Cic. Att. 6, 1, 13.— Nonius Marcellus, a Roman grammarian, whose treatise De Proprietate Sermonis is extant in a very mutilated form.

Origins

Perhaps related to Umbrian Noniar.

In the Academy Smith's classical dictionaries

Biography & mythologyNoniusNonius. 8. C. Nonius Asprenas, probably a son of the preceding, was accused, in B. C. 9. of poisoning 130 guests at a banquet, but the number in Pliny…

Quick answers

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