(in Kantian ethics) reason applied to the problem of action and choice, especially in ethical matters.
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Origin of practical reason
First recorded in 1895–1900
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for practical reason
noun philosophy logic
the faculty by which human beings determine how to act
reasoning concerning the relative merits of actions
the principles governing arguments which issue in actions or intentions to act
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012