definition of parity by The Free Dictionary

par·i·ty 1


n. pl. par·i·ties

1. Equality, as in amount, status, or value.

2. Functional equivalence, as in the weaponry or military strength of adversaries: “A problem that has troubled the U.S.-Soviet relationship from the beginning has been the issue of parity” (Charles William Maynes).

3. The equivalent in value of a sum of money expressed in terms of a different currency at a fixed official rate of exchange.

4. Equality of prices of goods or securities in two different markets.

5. A level for farm-product prices maintained by governmental support and intended to give farmers the same purchasing power they had during a chosen base period.

6. Mathematics The even or odd quality of an integer. If two integers are both odd or both even, they are said to have the same parity; if one is odd and one even, they have different parity.

7. Abbr. P Physics

a. An intrinsic symmetry property of a physical system, such as a subatomic particle, that specifies how the system would behave if the three spatial coordinates were reversed from x, y, z to -x, -y, -z.

b. A quantum number, either +1 (even) or -1 (odd), that mathematically represents this property.

8. Computers

a. The even or odd quality of the number of 1’s or 0’s in a binary code, often used to determine the integrity of data especially after transmission.

b. A parity bit.

[French parité, from Old French parite, from Late Latin paritās, from pār, par-, equal; see pair.]

par·i·ty 2



1. The condition of having given birth.

2. The number of children borne by one woman.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.



n, pl -ties

1. equality of rank, pay, etc

2. close or exact analogy or equivalence

3. (Banking & Finance) finance

a. the amount of a foreign currency equivalent at the established exchange rate to a specific sum of domestic currency

b. a similar equivalence between different forms of the same national currency, esp the gold equivalent of a unit of gold-standard currency

4. (Banking & Finance) equality between prices of commodities or securities in two separate markets

5. (General Physics) physics

a. a property of a physical system characterized by the behaviour of the sign of its wave function when all spatial coordinates are reversed in direction. The wave function either remains unchanged (even parity) or changes in sign (odd parity)

b. a quantum number describing this property, equal to +1 for even parity systems and –1 for odd parity systems. Symbol: P See also conservation of parity

6. (Mathematics) maths a relationship between two integers. If both are odd or both even they have the same parity; if one is odd and one even they have different parity

7. (Agriculture) (in the US) a system of government support for farm products

[C16: from Late Latin pāritās; see par]




1. (Gynaecology & Obstetrics) the condition or fact of having given birth

2. (Gynaecology & Obstetrics) the number of children to which a woman has given birth

[C19: from Latin parere to bear]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈpær ɪ ti)

n., pl. -ties.

1. equality, as in amount, status, or character.

2. equivalence or correspondence; similarity.


a. equivalent value in the currency of another country.

b. equivalent value at a fixed ratio between moneys of different metals.

4. the property of symmetry between a subatomic particle and its mirror image, indicated by + 1 if the two are indistinguishable and by −1 if they are different.

5. a system of regulating prices of farm commodities, usu. by government price supports, to provide farmers with the same purchasing power they had in a selected base period.

6. the status, as even or odd, of the total number of bits per byte or word: used to detect errors in a computer system or in data communications.

[1565–75; paritās. See par, -ity]


(ˈpær ɪ ti)


1. the condition of having borne offspring.

[1875–80; par(ere) to bring forth (compare parent) + -ity]

Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


the state, quality, or fact of having given birth to or having borne offspring.

See also: Birth

-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.

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