Per

From Latin per ("through, during"), from Proto-Indo-European *per.

Full definition of per

for eachAdmission is Â£10 per person.
to each, in each (used in expressing ratios of units)miles per gallonbeats per minute
(medicine) via (the), by (the), through (the) followed by Latin name for an orificeIntroduce the endoscope per nasum.The medication is to be administered per os.
in accordance withI parked my car at the curb per your request.

The preposition per is typically followed by a singular noun phrase with no determiner.

Take one pill per day. not Take one pill per a day.

It is sometimes followed by plural noun phrases, almost always determined by 100, 1,000, 100,000, etc.

The abortion rate in the U.S. has dropped since 1980 from nearly 30 per 1,000 women of childbearing age to less than 20.

shortening of person, coined by Marge Piercy in Woman on the Edge of Time (1979)

(third-person singular, gender-neutralreflexive - perself)

1997 April 22, "Anthony and Joy Hilbert" (username), "ASB: Info PDQ please re local group rules", in alt.sex.bondage

, Usenet:

This is the same place the Houghtons came from? The place where someone we interacted with thought of going into law as a profession, decided per couldn't because per was a bdsmer, and most of the USAmerican bdsmers per was discussing it with agreed with per?

(neologism) them singular Gender-neutral third-person singular object pronoun, grammatically equivalent to the gendered him and her.

1997 April 22, "Anthony and Joy Hilbert" (username), "ASB: Info PDQ please re local group rules", in alt.sex.bondage

, Usenet:

This is the same place the Houghtons came from? The place where someone we interacted with thought of going into law as a profession, decided per couldn't because per was a bdsmer, and most of the USAmerican bdsmers per was discussing it with agreed with per?

(neologism) Belonging to per, their singular. Gender-neutral third-person singular possessive adjective, coordinate with gendered his and her.