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From proper +‎ -ness.



properness (usually uncountable, plural propernesses)

  1. The state or condition of being proper; propriety.
  2. (mathematics) The state or condition of being proper (of a proper fraction, proper subset, etc.).
  3. (obsolete) Excellence, quality.
    • 1621, Democritus Junior [pseudonym; Robert Burton], The Anatomy of Melancholy, Oxford: Printed by Iohn Lichfield and Iames Short, for Henry Cripps, OCLC 216894069:, II.3.2:
      Ignatius Loyola, the founder of the Jesuits [] betook himself to his beads, and by those means got more honour than ever he should have done with the use of his limbs and properness of person []