rational

an integer or a fraction

consistent with or based on or using reason; "rational behavior"; "a process of rational inference"; "rational thought"

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

capable of being expressed as a quotient of integers; "rational numbers"

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