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The Collaborative International Dictionary of English v.0.48:

Abba \Ab"ba\ ([a^]b"b[.a]), n. [Syriac abb[=a] father. See Abbot.] Father; religious superior; -- in the Syriac, Coptic, and Ethiopic churches, a title given to the bishops, and by the bishops to the patriarch. [1913 Webster]
Easton's 1897 Bible Dictionary:

Abba This Syriac or Chaldee word is found three times in the New Testament (Mark 14:36; Rom. 8:15; Gal. 4:6), and in each case is followed by its Greek equivalent, which is translated "father." It is a term expressing warm affection and filial confidence. It has no perfect equivalent in our language. It has passed into European languages as an ecclesiastical term, "abbot."
Hitchcock's Bible Names Dictionary (late 1800's):

Abba, father