Dictionary.com
Thesaurus.com

idea of pure reason

American  
[ahy-dee-uh uhv pyoor ree-zuhn] / aɪˈdi ə əv ˈpyʊər ˈri zən /

noun

Kantianism.

  1. any of the three undemonstrable entities (a personal soul, a cosmos, and asupreme being ) implicit in the fact of a subject and an object of knowledge, and in the need for some principle uniting them.

Etymology

Origin of idea of pure reason

First recorded in 1810–20

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.