The Collaborative International Dictionary of English v.0.48:

Spinozism \Spi*no"zism\, n.
   The form of Pantheism taught by Benedict Spinoza, that there
   is but one substance, or infinite essence, in the universe,
   of which the so-called material and spiritual beings and
   phenomena are only modes, and that one this one substance is
   God. [Written also Spinosism.]
   [1913 Webster]