Easton's Bible Dictionary (1897)
Champion of God, used as a proper name to designate the angel who was sent to Daniel (8:16) to explain the vision of the ram and the he-goat, and to communicate the prediction of the seventy weeks (Dan. 9:21-27). He announced also the birth of John the Baptist (Luke 1:11), and of the Messiah (26). He describes himself in the words, “I am Gabriel, who stand in the presence of God” (1:19).
Smith's Bible Dictionary (1863)
(man of God), an angel sent by God to announce to Zacharias the birth of John the Baptist, and to Mary the birth of Christ. He was also sent to Daniel to explain his visions.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
GA'BRIEL (man of God), an angel specially charged with the message to Zacharias respecting the birth of John, and to Mary respecting the birth of Christ. Luke 1:19-26. At an earlier period he was sent to Daniel to unfold a vision. Dan 8:16; Dan 9:21. See Angels.
Hitchcock's Bible Names (1869)
God is my strength