Word:

# Parity

Par´i`ty
 n. 1 The quality or condition of being equal or equivalent; a like state or degree; equality; equivalence; close correspondence; analogy; as, parity of reasoning.Equality of length and parity of numeration.- Sir T. Browne. 2 (Finance) Equivalence in value to the currency of another country. 3 (Physics) A property assigned to elementary particles, conceptualized as a form of symmetry, representing the fact that no fundamental distinctions can be observed between right-handed and left-handed systems of particles in their interactions, and supported by the typical observation that the total parity of a system is unchanged as particles are created or annihilated; however, certain interactions involving the weak force have been shown to violate the principle of conservation of parity. 4 (Physics) A property of the wave function of a system, which takes the value of +1 or -1, indicating whether the value of the wave function changes sign if each of the variables of the system is replaced by its negative. 5 (Med.) The condition of having borne a child or children, alive or dead. 6 (Math.) The property of being even or odd; as, 3 has odd parity, but 6 has even parity. 7 (Computers) The property of having an even or odd number of bits set to the value of 1 (as opposed to 0); - applied to bytes or larger groups of bits in a data structure. It is used mostly in the process of parity checking. The parity of a data structure can be changed by changing the value of the parity bit.
 Noun 1 parity - (obstetrics) the number of live-born children a woman has delivered; "the parity of the mother must be considered"; "a bipara is a woman who has given birth to two children"Synonyms: para 2 parity - (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 3 parity - (computer science) abit 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., if the parity is odd then any group of bits that arrives with an even number of 1's must contain an errorSynonyms: check bit, parity bit 4 parity - (physics) parity is conserved in a universe in which the laws of physics are the same in a right-handed system of coordinates as in a left-handed system 5 parity - functional equality
 (storage, communications) parity - An extra bit added to a byte or word to reveal errors in storage (in RAM or disk) or transmission. Even (odd) parity means that the parity bit is set so that there are an even (odd) number of one bits in the word, including the parity bit. A single parity bit can only reveal single bit errors since if an even number of bits are wrong then the parity bit will not change. Moreover, it is not possible to tell which bit is wrong, as it is with more sophisticated error detection and correction systems.See also longitudinal parity, checksum, cyclic redundancy check.
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