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

the special and significant name (not merely an appellative title such as Lord [adonai]) by which God revealed himself to the ancient Hebrews (Exodus 6:2,3). This name, the Tetragrammaton of the Greeks, was held by the later Jews to be so sacred that it was never pronounced except by the high priest on the great Day of Atonement, when he entered into the most holy place. Whenever this name occurred in the sacred books they pronounced it, as they still do, "Adonai" (i.e., Lord), thus using another word in its stead. The Massorets gave to it the vowel-points appropriate to this word. This Jewish practice was founded on a false interpretation of Leviticus 24:16. The meaning of the word appears from Exodus 3:14 to be "the unchanging, eternal, self-existent God," the "I am that I am," a convenant-keeping God. (Compare Malachi 3:6; Hosea 12:5; Revelation 1:4,8.)

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

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