LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Otācilius

Otācilius m sg (genitive Otāciliī or Otācilī)
Classical[ɔ.taːˈkɪ.li.ʊs]Ecclesiastical[o.taˈt͡ʃiː.li.us]

Meaning

  1. a Roman nomen gentile, gens or "family name" famously held by
  2. Manius Otacilius Crassus, a Roman consul

Declension

declension
formsingularplural
nominativeOtācilius—
genitiveOtāciliī
Otācilī
—
dativeOtāciliō—
accusativeOtācilium—
ablativeOtāciliō—
vocativeOtācilī—

Ŏtācĭlĭus, i, m., Ŏtācĭlĭa, ae, f.,
I. the name of a Roman gens. So,
1. Otacilius Crassus, an adherent of Pompey, Caes. B. C. 3, 28 sq.—
2. T. Otacilius, a proprœtor, Liv. 22, 56.—In fem.: OTACILIA, Inscr. Grut. 29, 2; Eckh. D. N. 7, p. 332.—Hence,
II. OTACILIANA VILLA, of an Otacilius, Inscr. Marin. Fratr. Arv. p. 577.

In the Academy Smith's classical dictionaries

Quick answers

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