The Aramaic word "Abba" is thought to be a very intimate term for "Father" suggesting that those who use it to refer to God enjoy a close relationship with him. Jesus Christ uses the term as a consequence of his natural sonship of God; believers may use it as a consequence of their adopted sonship of God through faith.

Mark 14:36

"Abba" used in addressing God

By Jesus Christ

Romans 8:15
Galatians 4:6

By believers

See also

1040 God, fatherhood
1205 God, titles of
1510 Trinity, the
2078 Christ, sonship of
2218 Christ, Son of God
3221 Holy Spirit & prayer
5895 intimacy
7922 fellowship with God
8104 assurance
8134 knowing God