For each. / To each, in each (used in expressing ratios of units). / (medicine) By the, by means of the, via the, through the. / In accordance with, as per

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

(rare, nonstandard) They (singular). Gender-neutral neologistic third-person singular subject pronoun, coordinate with gendered pronouns he and she.

(nutrition) Initialism of protein efficiency ratio.

(non-productive) In verbs: denoting the sense "through", as in perforate. / (non-productive) In verbs: denoting the sense "thoroughly", as in perfect.

(non-productive) Denoting the sense "by" or "per", as in perchance or perhaps.

Consistent, or in accordance, with; according to

Abbreviation of period.

Abbreviation of Perthshire.

(rare, nonstandard) That which belongs to per, theirs (singular): possessive case of per, used in place of a noun.