LATIN DICTIONARYLexicon Latīnum
proper nounfirst declension

Achāia

Achāia or Achāïa f sg (genitive Achāiae or Achāïae)
Classical[aˈkʰaː.ja]Ecclesiastical[aˈkaː.ja]

Meaning

  1. Achaea (northern part of the Peloponnese)
  2. Achaea (Roman province encompassing all of Greece)

Declension

declension
formsingularplural
nominativeAchāia—
genitiveAchāiae—
dativeAchāiae—
accusativeAchāiam—
ablativeAchāiā—
vocativeAchāia—

Ăchāia or (in poets) Ăchāĭa (quadrisyl.), ae, f. Ἀχαία.
I. The province of Achaia, in the northern part of the Peloponnesus, on the Gulf of Corinth, earlier called Aegialea (maritime country), Mel. 2, 3, 4; Plin. 4, 5, 6.—Hence,
B. In gen. (cf. the Homeric Ἀχαιοί), for Greece, opposite to Troja: et quot Troja tulit, vetus et quot Achaia formas, Prop. 2, 21, 53; cf. Ov. M. 8, 268; id. Her. 17, 209 al.—
II. After the destruction of Corinth by Mummius, B. C. 146, Greece proper became a Rom. prov. under the name of Achaia.— Hence, ăchāĭăs, ădis, adj., An Achaean or Greek woman, Ov. H. 3, 71.—ăchāĭ-cus, a, um, adj., Achaean, Grecian.
I. Poet., opp. to Trojan: manus, Verg. A. 5, 623: ignis, Hor. C. 1, 15, 35.—
II. Belonging to the Roman province Achaia: homines, Cic. Att. 1, 13, 1: negotium, id. Fam. 4, 4, 2: concilium, Liv. 43, 17, 4.—Hence L. Mummius obtained, for the destruction of Corinth and the complete subjugation of Greece, the honorary title of Achaïcus. Vell. 1, 13, 2; Plin. 35, 4, 8, § 24; and so as surname of one of his descendants: Mummia Achaica, Suet. Galb. 3.—ăchāĭs, ĭdis, adj., f.
I. Achaean, Grecian: urbes, Ov. M. 5, 306.—
II. Subst., = Achaia, Achaia, Greece, Ov. M. 5, 577; 7, 504.— ăchāĭus, a, um, adj.: Achaean, Grecian (poet. for Achaïcus and Achaeus): castra, Verg. A. 2, 462; so Sil. 14, 5; 15, 306.

Origins

Borrowed from Ancient Greek Ἀχᾱΐᾱ (Akhāḯā).

In the Academy Smith's classical dictionaries

Quick answers

What does Achāia mean in Latin?
Achāia, a proper noun, means “Achaea (northern part of the Peloponnese); Achaea (Roman province encompassing all of Greece)”.
What is the genitive of Achāia?
The genitive singular is Achāiae. Achāia is first declension.
How do you pronounce Achāia?
In classical Latin, [aˈkʰaː.ja]; in ecclesiastical (church) Latin, [aˈkaː.ja].