LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Sēius

Sēius m sg (genitive Sēiī or Sēī)
Classical[ˈseː.jʊs]Ecclesiastical[ˈsɛː.jus]

Meaning

  1. a Roman nomen gentile, gens or "family name" famously held by
  2. Lucius Seius Strabo, a Roman prefect

Declension

declension
formsingularplural
nominativeSēius—
genitiveSēiī
Sēī		—
dativeSēiō—
accusativeSēium—
ablativeSēiō—
vocativeSēī—

Sējus or Sēius, i, m.,
I. a Roman name, Varr. R. R. 3, 2, 7; 3, 2, 11 sq.; Cic. Planc. 5, 12; id. Off. 2, 17, 58; Tac. A. 2, 20; 4, 1; 6, 7 al.—Hence,
II. Sējānus, a, um, adj., of or belonging to Sejus, Sejan: aedes, Varr. R. R. 3, 2, 7 fin.: pastiones, id. ib. 3, 2, 7, § 12: equus, the horse of a certain Cn. Sejus, that brought misfortune to him and to all subsequent possessors: hinc proverbium de hominibus calamitosis ortum dicique solitum: ille homo habet equum Sejanum, Gell. 3, 9, 6.—
B. Subst.: L. Aelius Sejanus, son of Sejus Strabo, the powerful praefectus praetorii of Tiberius, Tac. A. 4, 1 sq.; Tib. 55 sq.—Hence, Sējānĭānus, a, um, adj., of or pertaining to L. Ælius Sejanus: satellites, Sen. Cons. ad Marc. 1, 2: Sejanianum jugum, id. ib. 1, 3.

In the Academy Smith's classical dictionaries

Biography & mythologySeiusSeius. 1. M. SEIUS L. F., distinguished himself by his largesses to the people in his curule aedileship, although he had been previously condemned to …

Quick answers

What does Sēius mean in Latin?
Sēius, a proper noun, means “a Roman nomen gentile, gens or "family name" famously held by”.
What is the genitive of Sēius?
The genitive singular is Sēiī. Sēius is masculine, second declension.
How do you pronounce Sēius?
In classical Latin, [ˈseː.jʊs]; in ecclesiastical (church) Latin, [ˈsɛː.jus].