• Logically sound; not contradictory or otherwise absurd.

    "His statements were quite rational."

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

    "Man is a rational creature."

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

    "¾ is a rational number, but √2 is an irrational number."

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

    "rational conduct"

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


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

    "The quotient of two rationals is again a rational."

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