The definition of hallelujah is an expression of praise or thanks or rejoicing (especially in a religious context), or a hymn or piece of church music containing this word of praise.(noun)
Hallelujah is defined as an expression of praise or thanks or rejoicing, especially in a religious context.(interjection)
When you give thanks to God or express religious joy, this is an example of a time when you might say "Hallelujah!"
See hallelujah in Webster's New World College Dictionary
Origin: LL(Ec) alleluja < Gr(Ec) hallēlouia < Heb < hallelū, praise (imper.) + yāh, Jehovah
See hallelujah in American Heritage Dictionary 4
Origin: Hebrew halləlû-yāh, praise Yahweh
Origin: : halləlû
Origin: , masculine pl. imperative of hillēl, to praise; see hll in Semitic roots
Origin: + yāh, Yahweh; see hwy in Semitic roots.
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