All 5 Uses

rational
in
The Wide Window
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There are two kinds of fears: rational and irrational—or, in simpler terms, fears that make sense and fears that don't.†
p. 30.3 *

rational = reasonable
Being afraid of a monster under the bed is perfectly rational, because there may in fact be a monster under your bed at any time, ready to eat you all up, but a fear of realtors is an irrational fear.†
p. 30.6
As Violet, Klaus, and Sunny looked down at the dark lake and thought about their new lives with Aunt Josephine, they experienced a fear themselves, and even a worldwide expert on fear would have difficulty saying whether this was a rational fear or an irrational fear.†
p. 31.4
But on the other hand, the Baudelaires had experienced so many terrible things that it seemed rational to think that another catastrophe was just around the corner.†
p. 31.9
They knew now that their fear had been rational.†
p. 60.7

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.