εὐθεῖα

See also: εὐθεία and εὐθείᾳ

Ancient Greek

εὐθεῖᾰ • (eutheîă) f (genitive εὐθείᾱς); first declension

(grammar) Ellipsis of εὐθεῖα πτῶσις (eutheîa ptôsis, “nominative case”, literally “straight case”).
(geometry) Ellipsis of εὐθεῖα γραμμή (eutheîa grammḗ, “straight line”).
- 350 BCE – 250 BCE, Euclid, Elements 1:
  διάμετρος δὲ τοῦ κύκλου ἐστὶν εὐθεῖά τις διὰ τοῦ κέντρου ἠγμένη καὶ περατουμένη ἐφ᾽ ἑκάτερα τὰ μέρη ὑπὸ τῆς τοῦ κύκλου περιφερείας, ἥτις καὶ δίχα τέμνει τὸν κύκλον.
  diámetros dè toû kúklou estìn eutheîá tis dià toû kéntrou ēgménē kaì peratouménē eph’ hekátera tà mérē hupò tês toû kúklou periphereías, hḗtis kaì díkha témnei tòn kúklon.
  (please add an English translation of this quotation)

First declension of ἡ εὐθεῖᾰ; τῆς εὐθείᾱς (Attic)

Case / #	Singular	Dual	Plural
Nominative	ἡ εὐθεῖᾰ hē eutheîă	τὼ εὐθείᾱ tṑ eutheíā	αἱ εὐθεῖαι hai eutheîai
Genitive	τῆς εὐθείᾱς tês eutheíās	τοῖν εὐθείαιν toîn eutheíain	τῶν εὐθειῶν tôn eutheiôn
Dative	τῇ εὐθείᾳ tēî eutheíāi	τοῖν εὐθείαιν toîn eutheíain	ταῖς εὐθείαις taîs eutheíais
Accusative	τὴν εὐθεῖᾰν tḕn eutheîăn	τὼ εὐθείᾱ tṑ eutheíā	τᾱ̀ς εὐθείᾱς tā̀s eutheíās
Vocative	εὐθεῖᾰ eutheîă	εὐθείᾱ eutheíā	εὐθεῖαι eutheîai
Notes:	This table gives Attic inflectional endings. For declension in other dialects, see Appendix:Ancient Greek dialectal declension.

εὐθεῖᾰ • (eutheîă)