LATIN DICTIONARYLexicon Latīnum
proper noun · masculinethird declension

Iāsōn

Iāsōn m sg (genitive Iāsonis)
Classical[iˈaː.soːn]Ecclesiastical[iˈaː.s̬on]

Meaning

  1. Jason (a Greek hero who was the son of Aeson, king of Thessaly, and leader of the Argonauts)
    ultaque se male mater Iasonis effugit arma.And the avenged mother wickedly fled the sword of Jason by herself.8 CE, Ovidius, Metamorphoses 7.397

Declension

declension
formsingularplural
nominativeIāsōn—
genitiveIāsonis—
dativeIāsonī—
accusativeIāsonem—
ablativeIāsone—
vocativeIāsōn—

Ĭāson or Ĭāso (e. g. Mel. 1, 19, 5), ŏnis, m., = Ἰάσων.
I. Jason, a famous Grecian hero, son of Æson, king of Thessaly, the leader of the Argonauts, a sharer in the Calydonian boar-hunt, the husband of Medea, and afterwards of Crĕūsa, Cic. Tusc. 4, 32, 69; Ov. M. 7, 5 sq.; 8, 301; 348; Val. Fl. et saep.; Hyg. F. 12, 14; 16: quo jam mercator Iason clausus et armatis obstat casa candida nautis, i. e. when the fresco in the portico of Agrippa, representing Jason and his sailors, is hidden by the white canvas tents of the dealers at the fancy fair, Juv. 6, 153 sq.—Also, the name of a poem by Varro Atacinus, Prop. 2, 34 (3, 32), 85.—
B. Derivv.
1. ĭāsŏnĭus, a, um, adj., of or belonging to Jason: carina, i. e. the ship Argo, Prop. 2, 24 (3, 19), 45: remige, i. e. Argonautic, Ov. P. 3, 1, 1.—
2. ĭāsŏnĭdes, ae, m., a male descendant of Jason: juvenes, i. e. Thoas and Euneus, sons of Jason, Stat. Th. 6, 340.—
II. A ruler of Pherœ, in Thessaly, Cic. Off. 1, 30, 108; id. N. D. 3, 28, 70; Val. Max. 9, 10; Nep. Timoth. 4, 2.

Origins

From the Ancient Greek Ἰάσων (Iásōn).

In the Academy Smith's classical dictionaries

Quick answers

What does Iāsōn mean in Latin?
Iāsōn, a proper noun, means “Jason (a Greek hero who was the son of Aeson, king of Thessaly, and leader of the Argonauts)”.
What is the genitive of Iāsōn?
The genitive singular is Iāsonis. Iāsōn is masculine, third declension.
How do you pronounce Iāsōn?
In classical Latin, [iˈaː.soːn]; in ecclesiastical (church) Latin, [iˈaː.s̬on].