<p><strong>Preposition</strong></p><ul><li>for each; for every: Membership costs ten dollars per year. This cloth is two dollars per yard.</li><li>by means of; by; through: I am sending the recipe per messenger.</li><li>also: according to; in accordance with: I delivered the box per your instructions. He managed to monopolize the meeting, per usual.</li></ul><p><strong>Adverb</strong></p><ul><li>Informal. each; for each one: The charge for window-washing was five dollars per.</li></ul>