Rationalization (making excuses), the process of constructing a logical justification for a decision that was originally arrived at through a different mental process
Rationalization (economics), an attempt to change a pre-existing ad-hoc workflow into one that is based on a set of published rules. Also, business jargon for a reduction in numbers
Rationalisation (mathematics), the process of removing a square root or imaginary number from the denominator of a fraction
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