All 5 Uses

rational
in
Misery, by Stephen King
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The tide was still in and he could have gone back to sleep, wanted to go back to sleep, but he had to think about this bizarre situation while he was still capable of something like rational thought.†
Chpt 1

rational = reasonable
From some final stronghold of sanity and evaluative clarity the rational Paul Sheldon had thought: She looks like a widow who just got fucked after a ten-year dry spell.†
Chpt 1
He had constantly refused, for no rational reason: it was just that making copies seemed a jinx thing to do.†
Chpt 1 *
Knowing that door must lead to the cellar and seeing that there were no locks on it had made the idea of torching the place seem momentarily more rational, he could maybe shelter there.†
Chpt 2
In the dark, rationality seemed stupid and logic a dream.†
Chpt 3

rationality = use of reason

Definitions:

(1) (rational as in: rational behavior)
reasonable, able to think clearly, or based on logic rather than emotion
(2) (meaning too rare to warrant focus)
More rarely, rational numbers in mathematics are numbers that can be expressed as a fraction consisting of only an integer in the numerator and denominator. For example, 1/3 is a rational number while pi is an irrational number.