• enPR: ră'sh(ə)nəl, IPA: /ˈɹæʃ(ə)nəl/


  1. Capable of reasoning.
    Man is a rational creature.
  2. Logically sound; not contradictory or otherwise absurd.
    His statements were quite rational.
  3. (of a person or personal characteristics) Healthy or balanced intellectually; exhibiting reasonableness.
    rational conduct
  4. (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.
  5. (mathematics, arithmetic, not comparable) Of an algebraic expression, capable of being expressed as the ratio of two polynomials.
  6. (chemistry) Expressing the type, structure, relations, and reactions of a compound; graphic; said of formulae.
  7. (physics) Expressing a physical object.
    A rational table is physical, a written table is neither.
Antonyms Related terms Translations Translations Translations Translations Noun

rational (plural rationals)

  1. (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.

rational (plural rationals)

  1. (historical) The breastplate worn by Israelite high priests.
    • 1609, The Holie Bible, […] (Douay–Rheims Bible), Doway: Lavrence Kellam, […], OCLC 1006139495 ↗, Exodvs 28:15, page 234 ↗:
      The Rationale of iudgement alſo thou shalt mke with embrodered worke of diuers colours, according to the workmanship of the Ephod of gold, hyacinth, and purple, and ſcarlet twiſe died, and twiſted ſilke.

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