Noah Webster's Dictionary (n.) The mystic number four, which was often symbolized to represent the Deity, whose name was expressed by four letters among some ancient nations; as, the Hebrew JeHoVaH, Greek qeo`s, Latin deus, etc.

Multi-Version Concordance Tetragrammaton (1 Occurrence) Exodus 6:3 and I appeared unto Abraham, unto Isaac, and unto Jacob, as God Almighty; but by my name Jehovah I was not known to them. (See JPS)