Rational

rational

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1 : having reason or understanding
2 : relating to, based on, or guided by reason, principle, fairness, logic, a legitimate state interest, or a consideration of fact [age distinctions are not subject to strict scrutiny, but they must have a relationship to a legitimate state interest "In re J. M., 642 A.2d 1062 (1994)"]
ra·tio·nal·i·ty [ra-shə-na-lə-tē]
n

ra·tio·nal·ly adv