G0005
ἀββά
Abba
Ἀββά (T, -ᾶ), indecl. (Aram, אַבָּא, emphatic form of אַב = Heb. אָב, father), used in the phrase Ἀ. ὁ παήρ, Abba, Father (see Swete on Mk, I.with): Mrk.14:36, Rom.8:15, Gal.4:6.† (AS)
Full Thayer's lexicon entry
Ἀββᾶ — Abbâ
Ἀββᾶ (WH (βά), Hebrew אָב father, in the Chaldean emphatic state, אַבָּא i. e. ὁ πατήρ, a customary title of god in prayer. Whenever it occurs in the N. T. (Mar 14:36; Rom 8:15; Gal 4:6) it has the greek interpretation subjoined to it; this is apparently to be explained by the fact that the Chaldee אַבָּא, through frequent use in prayer, gradually acquired the nature of a most sacred proper name, to which the greek-speaking Jews added the appellative from their own tongue.
3 occurrences
Mark (1), Romans (1), Galatians (1)