- to ascribe (one's acts, opinions, etc.) to causes that superficially seem reasonable and valid but that actually are unrelated to the true, possibly unconscious and often less creditable or agreeable causes.
- to remove unreasonable elements from.
- to make rational or conformable to reason.
- to treat or explain in a rational or rationalistic manner.
- Mathematics. to eliminate radicals from (an equation or expression): to rationalize the denominator of a fraction.
- Chiefly British. to reorganize and integrate (an industry).
Also especially British, ra·tion·al·ise.
Origin of rationalize
Although rationalize retains its principal 19th-century senses “to make conformable to reason” and “to treat in a rational manner,” 20th-century psychology has given it the now more common meaning “to ascribe (one's acts, opinions, etc.) to causes that seem reasonable but actually are unrelated to the true, possibly unconscious causes.” Although the possibility of ambiguity exists, the context will usually make clear which sense is intended.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for rationalise
Her mother attempted to rationalise and formulate her daughter's position.A Likely Story
William De Morgan
She was resolved to understand herself, to rationalise her overthrow.Mount Music
E. Oe. Somerville and Martin Ross
The attempt to rationalise the narrative of Scripture was no new one.Edward Caldwell Moore
Our traditions will buttress and rationalise the instinct to power until we see that it is mischievous.The Fruits of Victory
The more popular method, therefore, at the present day is not to rationalise, but to try to outsceptic the sceptic.Social Rights and Duties, Volume I (of 2)
Sir Leslie Stephen
- to justify (one's actions, esp discreditable actions, or beliefs) with plausible reasons, esp after the event
- psychol to indulge, often unchallenged, in excuses for or explanations of (behaviour about which one feels uncomfortable or guilty)
- to apply logic or reason to (something)
- to eliminate unnecessary equipment, personnel, or processes from (a group of businesses, factory, etc), in order to make it more efficient
- (tr) maths to eliminate one or more radicals without changing the value of (an expression) or the roots of (an equation)
Word Origin and History for rationalise
Online Etymology Dictionary, © 2010 Douglas Harper
- To make rational.
- To devise self-satisfying but false or inconsistent reasons for one's behavior, especially as an unconscious defense mechanism through which irrational acts or feelings are made to appear rational to oneself.