Definitions

from The Century Dictionary.

  • noun The state of being rational, or consistent with reason.

from the GNU version of the Collaborative International Dictionary of English.

  • noun The quality or state of being rational; rationality.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun archaic The quality or state of being rational.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the quality of being consistent with or based on logic

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

rational +‎ -ness

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Examples

  • They who possess this faith, and cherish it as a priceless possession, may calmly oppose to the philosophic reasoning against the existence of [215] a Deity and the rationalness of entreating Him in prayer, the simple and sufficient declaration, "I believe."

    West Indian Fables by James Anthony Froude Explained by J. J. Thomas

  • In order to prove that they are not, and to have the means of judging hereafter of the rationalness of my present judgments, I will record the grounds of my despondency.

    The Life and Letters of Elizabeth Prentiss Prentiss, George L 1882

  • In order to prove that they are not, and to have the means of judging hereafter of the rationalness of my present judgments, I will record the grounds of my despondency.

    The Life and Letters of Elizabeth Prentiss George L. Prentiss 1859

  • Difficulties are kept out of view, and the beauty and rationalness of the ideal have all our thoughts.

    Culture and Anarchy Matthew Arnold 1855

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