Per- \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.
      [1913 Webster]

   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.
      [1913 Webster]

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]

PER
       Packed Encoding Rules (ASN.1)
       

PER
       Program Event Recording
       

PER

   1.  Packed Encoding Rules.

   2.  partial equivalence relation.

   (1998-05-27)

PER. By. When a writ of entry is sued out against the alienee, or descendant 
of the original disseisor, it is then said to be brought in the per, because 
the writ states that the tenant had not the entry but by the original wrong 
doer. 3 Bl. Com. 181. See Entry, writ of.