All 4 Uses

rational
in
The 5th Wave
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Maybe it wasn't rational, but the world I lived in wasn't rational anymore.†
p. 78.6

rational = reasonable
Maybe it wasn't rational, but the world I lived in wasn't rational anymore.†
p. 78.6
He's too calm, too rational, too cool for it to be completely, well, cool.†
p. 177.9
The last time she saw him was in their high school gymnasium after the lights went out, and then only the back of his head, and the only times that she's seen him since happened in her mind, the rational part of which always knew Ben Parish was dead like everyone else.†
p. 428.8 *

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.