What is the meaning of Rational?

Capable of reasoning.

Logically sound; not self-contradictory or otherwise absurd.

Healthy or balanced intellectually; exhibiting reasonableness.

Of a number, capable of being expressed as the ratio of two integers.

Of an algebraic expression, capable of being expressed as the ratio of two polynomials.

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

Expressing a physical object.

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

The breastplate worn by Israelite high priests.

rationale (religious clothing)

rational

Source: wiktionary.org