The meaning of Hallelujah in the Bible
(From Easton's Bible Dictionary)

praise ye Jehovah, frequently rendered "Praise ye the LORD," stands at the beginning of ten of the psalms (106,111-113,135,146-150), hence called "hallelujah psalms." From its frequent occurrence it grew into a formula of praise. The Greek form of the word (alleluia) is found in Revelation 19:1,3,4,6.

See more on the meaning of Hallelujah in the Bible:
Hallelujah {International Standard Bible Encyclopedia}
Hallelujah {Hitchcock's Bible Name}

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