hal·le·lu·jah 
(hăl′ə-lyə)
(hăl′ə-lyə)interj.
Used to express praise or joy.
n.
1. An exclamation of "hallelujah."
2. Music A composition expressing praise and based on the word "hallelujah."
[Hebrew halləlû-yāh, praise Yahweh : halləlû, masculine pl. imperative of hillēl, to praise; see hll in the Appendix of Semitic roots + yāh, Yahweh; see hwy in the Appendix of Semitic roots.]