Per /(?)/

Per

prep.
  1. Through; by means of; through the agency of; by; for; for each; as, per annum; per capita, by heads, or according to individuals; per curiam, by the court; per se, by itself, of itself. Per is also sometimes used with English words.

Phrases & Compounds

Per annum
by the year; in each successive year; annually.
per cent
by the hundred; in the hundred; a proportion multiplied by one hundred; -- used esp. of proportions of ingredients, rate or amount of interest, and the like; most commonly used in the shortened form, per cent, or as one word, percent; as, 5 is ten per cent of 50. It is commonly symbolized with the per cent sign, “%”.
Per diem
by the day.