Meaning

noun (obstetrics) the number of liveborn children a woman has delivered

noun (mathematics) a relation between a pair of integers: if both integers are odd or both are even they have the same parity; if one is odd and the other is even they have different parity

noun (computer science) a bit that is used in an error detection procedure in which a 0 or 1 is added to each group of bits so that it will have either an odd number of 1's or an even number of 1's; e.g.,

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

Etymology from Wiktionary, CC BY-SA 3.0