1. A rational number: a number that can be expressed as the quotient of two integers.
    The quotient of two rationals is again a rational.
  2. A rational being.


  1. Capable of reasoning.
    Man is a rational creature.
  2. Logically sound; not contradictory or otherwise absurd.
    ''His statements were quite rational.
  3. Healthy or balanced intellectually; exhibiting reasonableness.
    rational conduct
  4. Of a number, capable of being expressed as the ratio of two integers.
    <math>\tfrac{3}{4}</math> is a rational number, but √<span style = "text-decoration:overline">2</span> is an irrational number.
  5. Of an algebraic expression, capable of being expressed as the ratio of two polynomials.
  6. Expressing the type, structure, relations, and reactions of a compound; graphic; said of formulae.

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