Also, especially British, ra·tion·al·ise.
Related forms ra·tion·al·i·za·tion, noun
ra·tion·al·iz·er, noun
non·ra·tion·al·i·za·tion, noun
non·ra·tion·al·ized, adjective
o·ver·ra·tion·al·i·za·tion, noun
o·ver·ra·tion·al·ize, verb, o·ver·ra·tion·al·ized, o·ver·ra·tion·al·iz·ing.
sem·i·ra·tion·al·ized, adjective
un·ra·tion·al·ized, adjective
un·ra·tion·al·iz·ing, adjective
Usage note
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.