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tet·ra·gram·ma·ton | \ ˌte-trə-ˈgra-mə-ˌtän 
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\Definition of tetragrammaton
: the four Hebrew letters usually transliterated YHWH or JHVH that form a biblical proper name of God — compare yahweh
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Time Traveler for tetragrammaton
The first known use of tetragrammaton was in the 15th century
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