rationalise
Verb
Meaning
defend, explain, clear away, or make excuses for by reasoning
weed out unwanted or unnecessary things
remove irrational quantities from
think rationally; employ logic or reason
structure and run according to rational or scientific principles in order to achieve desired results
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Examples
It is characteristic of the British Public to look askance at any deliberate, systematic attempt to rationalise our institutions.
Our reason for withdrawal is simple. We are party to too many regional trading organisations. The sum effect of this means that our membership is extremely costly to sustain and we must rationalise our participation in such ventures.
[...] antisemitism is an irrational thing. The Jews are accused of specific offences (for instance, bad behaviour in food queues) which the person speaking feels strongly about, but it is obvious that these accusations merely rationalise some deep-rooted prejudice.
It is hard to rationalise or explain why you love what you love. But I have always been interested in science and maths, and in high school I was struck that you could use maths to understand nature and science.
Being a Barrymore didn't help me, other than giving me a great sense of pride and a strange spiritual sense that I felt OK about having the passion to act. It made sense because my whole family had done it and it helped rationalise it for me.
rationalize the child's seemingly crazy behavior