The Collaborative International Dictionary of English v.0.48:

Henotheism \Hen"o*the*ism\, n. [Gr. e"i`s, "enos`, one + E.
   theism.]
   Primitive religion in which each of several divinities is
   regarded as independent, and is worshiped without reference
   to the rest. [R.]
   [1913 Webster]