1. [Adjective]: consistent with or based on or using reason; "rational behavior"; "a process of rational inference"; "rational thought"

2. [Adjective]: capable of being expressed as a quotient of integers; "rational numbers"

3. having its source in or being guided by the intellect (distinguished from experience or emotion); "a rational analysis"

4. of or associated with or requiring the use of the mind; "intellectual problems"; "the triumph of the rational over the animal side of man"

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