The Collaborative International Dictionary of English v.0.48:

Per \Per\, prep. [L. Cf. Far, For-, Pardon, and cf. Par,
   prep.]
   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.
   [1913 Webster]

   Per annum, by the year; in each successive year; annually.


   per cent, Per centum, percent, 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; as, 5 is ten per cent of 50. It
      is commonly symbolized with the per cent sign, "%".

   Per diem, by the day. [For other phrases from the Latin,
      see Quotations, Phrases, etc., from Foreign Languages, in
      the Supplement.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

percent \per*cent"\ (p[~e]r*s[e^]nt"), n.
   A proportion multiplied by 100; as, he receives a percent of
   the proceeds; 3 is 75 percent of 4. Often symbolized by the
   character "%"; as, at 6% interest.

   Syn: percentage, per cent, pct.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

percent
    n 1: a proportion in relation to a whole (which is usually the
         amount per hundred) [syn: percentage, percent, per
         centum, pct]

The Free On-line Dictionary of Computing (30 December 2018):

percent
%

   %

   Common: ITU-T: percent sign; mod; grapes.  INTERCAL:
   double-oh-seven.

   (1995-03-06)