Also see definition of "Alleluia" in Word Study
praise the Lord
Alleluia [ebd]
the Greek form (Rev. 19:1, 3, 4, 6) of the Hebrew Hallelujah = Praise ye Jehovah, which begins or ends several of the psalms (106, 111, 112, 113, etc.).
ALLELUIA [smith]
so written in (Revelation 19:6) foll., or more properly
Also see definition of "Alleluia" in Word Study