English

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Etymology

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From rational +‎ -ness.

Noun

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rationalness (uncountable)

  1. (archaic) The quality or state of being rational.
    • 1861 August 31, “The New Papacy”, in The Nation, volume 13, number 322, retrieved 5 December 2011, page 142:
      And what difference is there between the credibleness and rationalness of any of these wonders and the credibleness and rationalness of Papal infallibility?

Synonyms

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References

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