Strong's G21 — ἀγαλλιάω (verb)
agalliao (ag-al-lee-ah'-o) v.
1. (properly) to jump for joy, i.e. exult
[from agan "much" and G242]
KJV: be (exceeding) glad, with exceeding joy, rejoice (greatly) 
Root(s): G242 
Hebrew root: ἅλλομαι
Occurrences: 11