The Collaborative International Dictionary of English v.0.48:

Jehovah \Je*ho"vah\, n. [Heb. usually y[e^]h[=o]v[=a]h (with the
   vowel points of [a^]d[=o]n[=a]i Lord), sometimes (to avoid
   repetition) y[e^]h[=o]vih (with the vowel points of
   [e^]l[=o]h[imac]m God); but only the four Heb, consonants
   yhvh are conceded to be certainly known.]
   A Scripture name of the Supreme Being, by which he was
   revealed to the Jews as their covenant God or Sovereign of
   the theocracy; the "ineffable name" of the Supreme Being,
   which was not pronounced by the Jews.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Yahweh \Yah"weh\ (y[aum]"w[e^]), Yahwe \Yah"we\, prop. n. Also
Jahveh \Jah"veh\ (y[aum]"w[e^]), Jahve \Jah"ve\, Yahve \Yahve\,
Yahveh \Yahveh\, etc.
   A modern transliteration of the Hebrew word translated
   Jehovah in the Bible; -- used by some critics to
   discriminate the tribal god of the ancient Hebrews from the
   Christian Jehovah. Yahweh or Yahwe is the spelling now
   generally adopted by scholars.

   Syn: Yahwe, Yahveh, Wahvey, Jahve, Jahveh, Jahvey, Jahweh,
        Jehovah.
        [Webster 1913 Suppl. +WordNet 1.5 +CM] Jahvism

WordNet (r) 3.0 (2006):

Jehovah
    n 1: a name for the God of the Old Testament as transliterated
         from the Hebrew consonants YHVH [syn: Yahweh, YHWH,
         Yahwe, Yahveh, YHVH, Yahve, Wahvey, Jahvey,
         Jahweh, Jehovah, JHVH]
    2: terms referring to the Judeo-Christian God [syn: Godhead,
       Lord, Creator, Maker, Divine, God Almighty,
       Almighty, Jehovah]

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "Jehovah":
   Almighty God, Alpha and Omega, Demiourgos, Demiurge, God,
   God Almighty, Heaven, I Am, King of Kings, Lord, Lord of Lords,
   Lord of hosts, Omnipotence, Omniscience, Providence, the Absolute,
   the Absolute Being, the All-holy, the All-knowing,
   the All-merciful, the All-powerful, the All-wise, the Almighty,
   the Creator, the Deity, the Divinity, the Eternal,
   the Eternal Being, the First Cause, the Infinite,
   the Infinite Spirit, the Maker, the Omnipotent, the Omniscient,
   the Preserver, the Supreme Being, the Supreme Soul



Easton's 1897 Bible Dictionary:

Jehovah
   the special and significant name (not merely an appellative
   title such as Lord [adonai]) by which God revealed himself to
   the ancient Hebrews (Ex. 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 Lev. 24:16. The meaning of the word
   appears from Ex. 3:14 to be "the unchanging, eternal,
   self-existent God," the "I am that I am," a convenant-keeping
   God. (Comp. Mal. 3:6; Hos. 12:5; Rev. 1:4, 8.)

     The Hebrew name "Jehovah" is generally translated in the
   Authorized Version (and the Revised Version has not departed
   from this rule) by the word LORD printed in small capitals, to
   distinguish it from the rendering of the Hebrew _Adonai_ and the
   Greek _Kurios_, which are also rendered Lord, but printed in the
   usual type. The Hebrew word is translated "Jehovah" only in Ex.
   6:3; Ps. 83:18; Isa. 12:2; 26:4, and in the compound names
   mentioned below.

     It is worthy of notice that this name is never used in the
   LXX., the Samaritan Pentateuch, the Apocrypha, or in the New
   Testament. It is found, however, on the "Moabite stone" (q.v.),
   and consequently it must have been in the days of Mesba so
   commonly pronounced by the Hebrews as to be familiar to their
   heathen neighbours.


Hitchcock's Bible Names Dictionary (late 1800's):

Jehovah, self-subsisting