τριάς

See also: -τριας

Ancient Greek

From τρι- (tri-) +‎ -άς (-ás).First use in the Christian theological sense dates back to the second century AD, predating Latin trinitas.

τρῐᾰ́ς • (triás) f (genitive τρῐᾰ́δος); third declension

the number three
- 428 BCE – 347 BCE, Plato, Phaedo 104a:
  ἀλλ’ ὅμως οὕτως πέφυκε καὶ ἡ τριὰς καὶ ἡ πεμπτὰς καὶ ὁ ἥμισυς τοῦ ἀριθμοῦ ἅπας
  all’ hómōs hoútōs péphuke kaì hē triàs kaì hē pemptàs kaì ho hḗmisus toû arithmoû hápas
  Yet the number three and the number five and half the numbers in general are so constituted.
a group of three; triad
- 371 BCE – 287 BCE, Theophrastus, On Winds 49:
  τελευτᾷ ἐν τῇ πρώτῃ τριάδι
  teleutâi en têi prṓtēi triádi
(prosody) system of three strophes
- Hephaestio, Collected Works 61C
(Christianity) Trinity
- 534 CE, Codex Justinianus 1.1.5.2

Third declension of ἡ τρῐᾰ́ς; τῆς τρῐᾰ́δος (Attic)

Case / #	Singular
Nominative	ἡ τρῐᾰ́ς hē triás
Genitive	τῆς τρῐᾰ́δος tês triádos
Dative	τῇ τρῐᾰ́δῐ têi triádi
Accusative	τὴν τρῐᾰ́δᾰ tḕn triáda
Vocative	τρῐᾰ́ς triás
Notes:	This table gives Attic inflectional endings. For declension in other dialects, see Appendix:Ancient Greek dialectal declension. Nominative singular -ς (-s) arose by reduction of the original cluster *-ds.

“τριάς”, in Liddell & Scott (1940) A Greek–English Lexicon, Oxford: Clarendon Press
“τριάς”, in Liddell & Scott (1889) An Intermediate Greek–English Lexicon, New York: Harper & Brothers
τριάς in Bailly, Anatole (1935) Le Grand Bailly: Dictionnaire grec-français, Paris: Hachette
Woodhouse, S. C. (1910) English–Greek Dictionary: A Vocabulary of the Attic Language‎, London: Routledge & Kegan Paul Limited.
- three idem, page 869.
- triad idem, page 893.