Relating to the reason; not physical; mental.

Having reason, or the faculty of reasoning; endowed with reason or understanding; reasoning.

Agreeable to reason; not absurd, preposterous, extravagant, foolish, fanciful, or the like; wise; judicious; as, rational conduct; a rational man.

Holds for voters that take actions they believe are most likely to lead their preferred outcome -- regardless of whether it is reasonable for them to prefer that outcome.

Expressing the type, structure, relations, and reactions of a compound; graphic; -- said of formulæ. See under Formula.

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

a numerator and denominator, both of type integer

rational number can be written as a ratio (i.e., fraction) of two integers. A rational function is one whose formula can be given as the ratio (i.e., quotient) of two polynomials.