parity

English

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

parity (countable and uncountable, plural parities)

(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:
  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.
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.
(games, countable) In reversi, the last move within a given sector of the board.
Resemblance; analogy.

equality, comparability

math: set whose elements all belong to one of exactly two disjoint subsets

math: classification into one set or the other

physics: symmetry of interaction

reversi: last move within a sector

From Latin paritas, from pariō (“give birth”).

parity (plural parities)

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

the number of times a sow has farrowed