1. \Per-\ [See {Per}.]
   1. A prefix used to signify through, throughout, by, for, or
      as an intensive as perhaps, by hap or chance; perennial,
      that lasts throughout the year; perforce, through or by
      force; perfoliate, perforate; perspicuous, evident
      throughout or very evident; perplex, literally, to
      entangle very much.
   2. (Chem.) Originally, denoting that the element to the name
      of which it is prefixed in the respective compounds
      exercised its highest valence; now, only that the element
      has a higher valence than in other similar compounds;
      thus, barium peroxide is the highest oxide of barium;
      while nitrogen and manganese peroxides, so-called, are not
      the highest oxides of those elements.
   

2. \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.
   {Per annum}, by the year; in each successive year; annually.
   {Per cent}, {Per centum}, by the hundred; in the hundred; --
      used esp. of proportions of ingredients, rate or amount of
      interest, and the like; commonly used in the shortened
      form per cent.
   {Per diem}, by the day. [For other phrases from the Latin,
      see Quotations, Phrases, etc., from Foreign Languages, in
      the Supplement.]
   

1. Packed Encoding Rules.

2. partial equivalence relation.