[on-tol-uh-jiz-uh m]
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noun Theology.
  1. the doctrine that the human intellect has an immediate cognition of God as its proper object and the principle of all its cognitions.

Origin of ontologism

First recorded in 1860–65; ontolog(y) + -ism
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018