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per (pûr)

[Latin.]

prep. 

  1. To, for, or by each; for every: Gasoline once cost 40 cents per gallon.
  2. According to; by: Changes were made to the manuscript per the author's instructions.
  3. By means of; through.

adverb 

Informal
  1. For each one; apiece: sold the cookies for one dollar per.
  2. Per hour: was driving at 60 miles per.