All 4 Uses

rational
in
The Scorch Trials
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He hoped it was because the Crank had finally accepted that his new visitor was going to take a rational and calm approach to their situation.†
p. 152.9 *

rational = reasonable
I think they're a little more gone than we are, starting to lose their rational sides.†
p. 175.6
You lose any chance of being rational, having common sense, having compassion.†
p. 204.8
Thomas paused, choosing his words carefully "I think it's a test to see if you'll think for yourself, change plans, make rational decisions.†
p. 279.5

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.