[adj] having its source in or being guided by the intellect (distinguished from experience or emotion); "a rational analysis"
[adj] of or associated with or requiring the use of the mind; "intellectual problems"; "the triumph of the rational over the animal side of man"
[adj] consistent with or based on or using reason; "rational behavior"; "a process of rational inference"; "rational thought"
[adj] (math) capable of being expressed as a quotient of integers; "rational numbers"