Lexical Definition

‎ὄναρ‎ ónar (on'-ar) dream ^G:N-N
of uncertain derivation

dream.

• a dream

Abbott-Smith

* ὄναρ, τό,
indecl., used only in nom, and acc. sing. (the other cases are supplied by ὄνειρος), a dream: κατ’ ὄ. (in later writers only), in a dream, Mt 1:20 2:12, 13, 19, 22 27:19.†

Abbott-Smith References

Liddell-Scott-Jones

ὄναρ, τό,

used only in nominative and accusative singular, the other cases being supplied by ὄνειρος (which see):— dream, vision in sleep, opposed to a waking vision, οὐκ ὄ., ἀλλ᾽ ὕπαρ ἐσθλόν [Refs 8th c.BC+]; ἄκουε δὴ ὄ. ἀντὶ ὀνείρατος dream for dream, [Refs 5th c.BC+]; ὥστε μηδὲ ὄ. ἰδεῖν, of profound sleep, [Refs] 'you are telling me what I know already', [Refs]

__2 proverbial of anything fleeting or unreal, ὀλιγοχρόνιον.. ὥσπερ ὄ. [Refs 6th c.BC+]; ὄ. ἡμερόφαντον ἀλαίνει, of an old man, [Refs 4th c.BC+]
__II in Trag. and Attic dialect frequently as adverb, in a dream, in sleep, ὄ. γὰρ ὑμᾶς νῦν Κλυταιμνήστρα καλῶ [Refs]; ὄ. διώκεις θῆρα[Refs 5th c.BC+], etc.; also οὐδ᾽ ὄ. not even in a dream, [Refs 5th c.BC+]; μηδ᾽ ἰδὼν ὄ. not even in my dreams, [Refs 5th c.BC+] 11; κατ᾽ ὄναρ in a dream, condemned by [NT+2nd c.AD+]: with sense, in consequence of a dream, in [Refs 2nd c.AD+]

_{LSJ Scripture Refs: Matt.1.20}