Capable of reasoning. / Logically sound; not self-contradictory or otherwise absurd. / (of a person or personal characteristics) Healthy or balanced intellectually; exhibiting reasonableness.

(mathematics) A rational number: a number that can be expressed as the quotient of two integers.

(historical) The breastplate worn by Israelite high priests.

plural of rational

To make something rational or more rational.

Suitable for being rationed.

(archaic) Rational, reasonable.

(now rare) Rationally, reasonably.

plural of rationality

plural of rationalism