from The American Heritage® Dictionary of the English Language, 4th Edition

  • prep. To, for, or by each; for every: Gasoline once cost 40 cents per gallon.
  • prep. According to; by: Changes were made to the manuscript per the author's instructions.
  • prep. By means of; through.
  • adv. Informal For each one; apiece: sold the cookies for one dollar per.
  • adv. Informal Per hour: was driving at 60 miles per.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • pro. they (singular). Gender-neutral third-person singular subject pronoun, coordinate with gendered pronouns he and she.
  • pro. them (singular) Gender-neutral third-person singular object pronoun, grammatically equivalent to the gendered him and her.
  • adj. Belonging to per, their (singular). Gender-neutral third-person singular possessive adjective, coordinate with gendered his and her.
  • prep. for each
  • prep. to each, in each (used in expressing ratios of units)
  • prep. via (the), by (the), through (the) (followed by Latin name for an orifice)
  • prep. in accordance with

from the GNU version of the Collaborative International Dictionary of English

  • prep. Through; by means of; through the agency of; by; for; for each. Per is also sometimes used with English words.

from The Century Dictionary and Cyclopedia

  • Through; by means of.
  • A prefix of Latin origin, meaning primarily ‘through.’ See the etymology.
  • As an inseparable prefix of intensity, ‘thoroughly,’ ‘very,’ as in peracute, perfervid, pellucid; specifically, in chem., noting the maximum or an unusual amount, as peroxid, the highest oxid, or an oxid containing more oxygen than the protoxid, etc.
  • n. In petrography, in the quantitative system of classification of igneous rocks (see rock), a prefix used to form adjectives, and showing that the factor or component indicated is present in any division of igneous rocks, alone or in extreme amount — that is, that its ratio to another factor is greater than : as, peralkalic, perfelic, perfemane, perfemic, etc.
  • n. An abbreviation of period.


Latin; see per1 in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin per ("through, during"), from Proto-Indo-European *per. (Wiktionary)
shortening of person, coined by Marge Piercy in Woman on the Edge of Time (1979) (Wiktionary)


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  • "per" in Hungarian means: process, trial, suit

    August 7, 2012

  • Rep in reverse. Slang for agent or reputation.

    November 2, 2007