Hallelujah is a transliteration of the Hebrew 2pl. imp. הַלְּלוּלָה, literally meaning: praise Jah!
"Jah" is the shorthand for "
YHWH" or "
Yaweh", and is the revealed name of God in the Old Testament. However, for the Hebrews or Jews the name of YHWH is to holy or sacred to even be uttered; thus, the name in the Old Testament is vocalized and proncounced as "
Adonai" אֲדנָי (Lord). Therefore, orthodox jewish singers, such as Josef Karduner, pronounce "Halellu-kah" to avoid desacralizing the name.
The most popular usage context of "Hallelujah" was in contexts of praise, a prime example being the hebrew
psalter, where the last five
psalms each begin with הללו יה "hallelu Jah". In modern day usage the term has conserved its originally usage context, and is popular in jewish, as in christian
liturgy and songs.
Example:
הללו יה (Hallelu
Jah)
הללו את־יהוה מן־השׁמים הללוהו במרומים (Hallelu et-Adonai min-hashamayim) (halleluhu bameromim)
Praise Jah!
Prais the Lord from the Heavens!
Praise him in the hights! (Ps
148,1)
(In this context the "Hallelujah" is being used to command the congregation to start worshipping the Lord for he is
exalted above everything)