Parity in a sentence as a noun

Even if the main Facebook app has feature parity with FBPhotos, it's still going to come with all of the cruft.

Can someone please explain why "feature parity" even matters here?

With the graying of the Baby Boomers, that ratio will approach parity.

Range: Already discussed above; near parity with many gas vehicles.

Look at his parity instructions - every feature is found in Photoshop Essentials.

In just over a decade, I've seen several hundred million people come out of absolutely grinding poverty into a lifestyle which is still poor but not truly deprived; I've seen several hundred million more acquire a standard of living that -- considering the difference in purchasing parity power -- is perfectly in line with first-world norms.

Parity definitions

noun

(obstetrics) the number of liveborn 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"

See also: para

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; "parity is often used to check the integrity of transmitted data"

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., if the parity is odd then any group of bits that arrives with an even number of 1's must contain an error

noun

(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

noun

functional equality