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Ἀββά

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament

Ἀββά (T, -ᾶ), indecl. (Aram, אַבָּא, emphatic form of אַב = Heb. אָב, father),

used in the phrase Ἀ. ὁ παήρ, Abba, Father (v. Swete on Mk 14:36): Mk 14:36, Ro 8:15, Ga 4:6.†