Brown Driver Briggs

 Jehoiada = "Jehovah knows"
1. father of Benaiah, David's mighty warrior
2. leader of the priests who joined David at Hebron
3. high priest at the time of Athaliah's usurpation of the throne of
Judah; hid Joash, the king's son, for six years and eventually
replaced him on the throne of Judah
4. second priest, or sagan, to Seraiah the high priest