Alleluia
Easton, 1897
The Greek form (Revelation 19:1, Revelation 19:3, Revelation 19:4, Revelation 19:6) of the Hebrew Hallelujah = Praise ye Jehovah, which begins or ends several of the psalms (106, 111, 112, 113, etc.).
Dictionary: M. G. Easton, Illustrated Bible Dictionary (1897, public domain).