n (physics|countable) Symmetry of interactions under spatial inversion.
n (context|uncountable)equality | Equality; comparability of strength or intensity.
n (mathematics|countable) A set with the property of having all of its elements belonging to one of two disjointsubsets, especially a set of integers split in subsets of even and odd elements.
n (mathematics|countable) The classification of an element of a set with parity into one of the two sets.
n (games|countable) In reversi, the last move within a given sector of the board.
n (medicine|countable) The number of times a woman has given birth.
n (agriculture|countable) The number of times a sow has farrowed.