From The Collaborative International Dictionary of English v.0.44 [gcide]:
1. (Philos.) The doctrine of certain extreme adherents or disciples of Descartes and Johann Gottlieb Fichte, which finds all the elements of knowledge in the ego and the relations which it implies or provides for.
From WordNet (r) 2.0 [wn]:
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Let's see what we can do if we put our heads together.0