parity

(uncountable) Equality; comparability of strength or intensity.

(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.

(mathematics, countable) The classification of an element of a set with parity into one of the two sets.

(computing) The count of one bits in a value, reduced to even or odd or zero or one.

(physics, countable) Symmetry of interactions under spatial inversion.

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

Resemblance; analogy.