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From The Collaborative International Dictionary of English v.0.48:
Yahwism \Yah"wism\, n. Also Jahvism \Jah"vism\ 1. The religion or worship of Yahweh (Jehovah), or the system of doctrines, etc., connected with it. [Webster 1913 Suppl.] 2. Use of Yahweh as a name of God. [Webster 1913 Suppl.] Jehovist Jahwist Jahvist