Jehovah n. : 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.

Example:
Are the Jehovah Witnesses in Australia different from the ones in America?

Taxonomy
Great Jehovah, Adonai, pronunciation, vowel points, Tetragrammaton, Hebrew, YHWH, God's name, transcription, vowels, John, English, Iehovah, translation, discourses, the Old Testament, the American, hataf.

Defination from the web:
Jehovah (pronounced /dʒɨˈhoʊvə/) is an English reading of יְהֹוָה, the most frequent form of the Tetragrammaton יהוה (transliterated as YHWH) ... Some sources question the received view that the vowels of Jehovah originate with the word Adonai rather than an ancient pronunciation of YHWH. ...