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1.
consistent with or based on or using reason
rational behavior
a process of rational inference
rational thought
2.
of or associated with or requiring the use of the mind
the triumph of the rational over the animal side of man
3.
capable of being expressed as a quotient of integers
rational numbers
4.
having its source in or being guided by the intellect (distinguished from experience or emotion)
a rational analysis
'rational' - used as a noun
5.
an integer or a fraction
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