attempt to explain or justify (one's own or another's behavior or attitude) with logical, plausible reasons, even if these are not true or appropriate.
she couldn't rationalize her urge to return to the cottage
make (a company, process, or industry) more efficient by reorganizing it in such a way as to dispense with unnecessary personnel or equipment.
his success was due primarily to his ability to rationalize production
convert (a function or expression) to a rational form.
I don't care about rationalising denominators with surds in them, and I don't care that by using maths induction you can prove many equations to be right or wrong.