LATIN DICTIONARYLexicon Latīnum
adjectivefirst/second-declension adjective

Īō̆nius

Īō̆nius (feminine Īō̆nia, neuter Īō̆nium)
Classical[iːˈoː.ni.ʊs]Ecclesiastical[iˈɔː.ni.us]

Meaning

  1. adjectiveof or belonging to Ionia, Ionian

Declension

singular
formmasculinefeminineneuter
nominativeĪō̆niusĪō̆niaĪō̆nium
genitiveĪō̆niīĪō̆niaeĪō̆niī
dativeĪō̆niōĪō̆niaeĪō̆niō
accusativeĪō̆niumĪō̆niamĪō̆nium
ablativeĪō̆niōĪō̆niāĪō̆niō
vocativeĪō̆nieĪō̆niaĪō̆nium
plural
formmasculinefeminineneuter
nominativeĪō̆niīĪō̆niaeĪō̆nia
genitiveĪō̆niōrumĪō̆niārumĪō̆niōrum
dativeĪō̆niīsĪō̆niīsĪō̆niīs
accusativeĪō̆niōsĪō̆niāsĪō̆nia
ablativeĪō̆niīsĪō̆niīsĪō̆niīs
vocativeĪō̆niīĪō̆niaeĪō̆nia

Īōnĭus, a, um, adj., = Ἰώνιος or Ἰόννιος,
I. of or belonging to Ionia, Ionian: attagen, Plin. 10, 48, 68, § 133: Ionium mare (or poet. aequor), or Ionii fluctus, Ionius sinus; or subst.: Ionium, i, n., the Ionic Sea, in the west of Greece: mare, Mel. 1, 3, 3; Plin. 3, 8, 14, § 88; Liv. 23, 33, 22; Verg. A. 5, 193: aequor, Ov. M. 15, 700: fluctus, Verg. G. 2, 108: sinus, Hor. Epod. 10, 19; and simply Ionium: insulae Ionio in magno, Verg. A. 3, 211: per Ionium vectus, Prop. 3 (4), 21, 19.(but Ionia is a false reading for Jovis, Plin. 37, 7, 29, § 103).—
II. Subst.: ĭōnĭa, ae, f., = Ἰωνία, Ionia, a country of Asia Minor on the Ægean Sea, between Caria and Æolis, Mel. 1, 17; 2, 7, 4; Plin. 5, 29, 31, § 112; Nep. Alc. 5, 6; Prop. 1, 6, 31; Ov. F. 6, 175 al.

Origins

From Iōnia + -ius.

Quick answers

What does Īō̆nius mean in Latin?
Īō̆nius, a adjective, means “of or belonging to Ionia, Ionian”.
How do you pronounce Īō̆nius?
In classical Latin, [iːˈoː.ni.ʊs]; in ecclesiastical (church) Latin, [iˈɔː.ni.us].