People's Dictionary of the Bible
Abba (ăb'bah), a Chaldee word signifying father (Hebrew ab), easily pronounced by infant children, and expressing the peculiar tenderness, familiarity, and confidence of the love between parent and child. Mark 14:36; Romans 8:15; Galatians 4:6. Luther translated Abba, Paler, "Abba, dear Father."
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Rice, Edwin Wilbur, DD. Entry for 'Abba'. People's Dictionary of the Bible. https://www.studylight.org/dictionaries/eng/rpd/a/abba.html. 1893.