Meaning of “rationalize” - Learner’s Dictionary

rationalize

verb ( also UK -ise) uk us /ˈræʃənəlaɪz/
FIND REASONS [ I, T ]

to try to find reasons to explain your behaviour or emotions:

I can't rationalize the way I feel towards him.
ORGANIZE [ T ] mainly UK

to improve the way a business is organized, usually by getting rid of people

rationalization ( also UK -isation) uk us /ˌræʃənəlaɪˈzeɪʃən/ noun [ C, U ]

(Definition of “rationalize” from the Cambridge Learner’s Dictionary © Cambridge University Press)