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

(historical) The breastplate worn by Israelite high priests.

Capable of reasoning.

Logically sound; not self-contradictory or otherwise absurd.

(of a person or personal characteristics) Healthy or balanced intellectually; exhibiting reasonableness.

(mathematics, arithmetic, number theory, not comparable) Of a number, capable of being expressed as the ratio of two integers.

(mathematics, arithmetic, not comparable) Of an algebraic expression, capable of being expressed as the ratio of two polynomials.

(chemistry) Expressing the type, structure, relations, and reactions of a compound; graphic; said of formulae.

(physics) Expressing a physical object.