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  • IPA(key): /ˈpæɹɪti/
  • (file)
  • Rhymes: -æɹɪti
  • Homophone: parody (intervocalic flapping, weak vowel merger)
  • Hyphenation: par‧i‧ty

Etymology 1[edit]

From Middle French parité, from Late Latin paritas, from Latin pār (equal). Equivalent to pari- +‎ -ty.


parity (countable and uncountable, plural parities)

  1. (uncountable) Equality; comparability of strength or intensity.
    • 2000 April 26, Microsoft Windows Server 2003 Delta Guide, Pearson Education, unpaged:
      Altogether, Microsoft claims a 99% feature parity between 32-bit and 64-bit editions.
    • 2011 October 29, Phil McNulty, “Chelsea 3 - 5 Arsenal”, in BBC Sport[1]:
      For all their frailty at the back, Arsenal possessed genuine menace in attack and they carved through Chelsea with ease to restore parity nine minutes before half-time. Aaron Ramsey's pass was perfection and Gervinho took the unselfish option to set up Van Persie for a tap-in.
  2. Senses related to classification into two sets.
    1. (mathematics, countable) A set with the property of having all of its elements belonging to one of two disjoint subsets, especially a set of integers split in subsets of even and odd elements.
      Parity is always preserved in such operations.
    2. (mathematics, countable) The classification of an element of a set with parity into one of the two sets.
      The particles' parities can switch at random.
    3. (computing) The count of one bits in a value, reduced to even or odd or zero or one.
    4. (physics, countable) Symmetry of interactions under spatial inversion.
  3. (games, countable) In reversi, the last move within a given sector of the board.
  4. Resemblance; analogy.
Derived terms[edit]

Etymology 2[edit]

From Latin paritas, from pariō (give birth).


parity (plural parities)

  1. (medicine, countable) The number of delivered pregnancies reaching viable gestational age, usually between 20-28 weeks
  2. (agriculture, countable) The number of times a sow has farrowed.