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From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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]

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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]

From V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2013) [vera]:

  PER
         Packed Encoding Rules (ASN.1)
         

From V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2013) [vera]:

  PER
         Program Event Recording
         

From Italian-English FreeDict Dictionary ver. 0.1.1 [fd-ita-eng]:

  per
   by; by means of; on; through; with

From Italian-English FreeDict Dictionary ver. 0.1.1 [fd-ita-eng]:

  per
   a long time; for a long time; long

From Italian-English FreeDict Dictionary ver. 0.1.1 [fd-ita-eng]:

  per
   1. unfortunately
   2. unfortunately

From Italian-English FreeDict Dictionary ver. 0.1.1 [fd-ita-eng]:

  per
   on that account; therefore

From Italian-English FreeDict Dictionary ver. 0.1.1 [fd-ita-eng]:

  per
   by marriage; ‐in‐law

From Italian-English FreeDict Dictionary ver. 0.1.1 [fd-ita-eng]:

  per
   1. fortunately
   2. unfortunately

From Italian-English FreeDict Dictionary ver. 0.1.1 [fd-ita-eng]:

  per
   so to speak

From Italian-English FreeDict Dictionary ver. 0.1.1 [fd-ita-eng]:

  per
   for example; for instance

From Italian-English FreeDict Dictionary ver. 0.1.1 [fd-ita-eng]:

  per
   at least

From Italian-English FreeDict Dictionary ver. 0.1.1 [fd-ita-eng]:

  per
   1. for the greater part; for the most part
   2. for the greater part; for the most part

From Swedish-English FreeDict Dictionary ver. 0.1.1 [fd-swe-eng]:

  per
   by; by means of; on; through; with

From German-English FreeDict Dictionary ver. 0.3.3 [fd-deu-eng]:

  per /pɛr/
   per

From Dutch-English Freedict Dictionary ver. 0.1.3 [fd-nld-eng]:

  per /pɛr/
   1. a; in; inside; into; on; per; within
   2. by; bymeansof; on; through; with
   3. a; per
   4. for; to; inorderto; per