Source : Webster's Revised Unabridged Dictionary (1913)

Restriction \Re*stric"tion\, n. [F. restriction, L. restrictio.]
   1. The act of restricting, or state of being restricted;
      confinement within limits or bounds.

            This is to have the same restriction with all other
            recreations,that it be made a divertisement. --Giv.
                                                  of Tonque.

   2. That which restricts; limitation; restraint; as,
      restrictions on trade.

Source : WordNet®

restriction
     n 1: a principle that limits the extent of something; "I am
          willing to accept certain restrictions on my movements"
          [syn: {limitation}]
     2: an act of limiting or restricting (as by regulation) [syn: {limitation}]
     3: the act of keeping something within specified bounds (by
        force if necessary)

Source : Free On-Line Dictionary of Computing

restriction
     
        A {bug} or design error that limits a program's capabilities,
        and which is sufficiently egregious that nobody can quite work
        up enough nerve to describe it as a {feature}.  Often used
        (especially by {marketroid} types) to make it sound as though
        some crippling bogosity had been intended by the designers all
        along, or was forced upon them by arcane technical constraints
        of a nature no mere user could possibly comprehend (these
        claims are almost invariably false).
     
        Old-time hacker Joseph M. Newcomer advises that whenever
        choosing a quantifiable but arbitrary restriction, you should
        make it either a power of 2 or a power of 2 minus 1.  If you
        impose a limit of 17 items in a list, everyone will know it is
        a random number - on the other hand, a limit of 15 or 16
        suggests some deep reason (involving 0- or 1-based indexing in
        binary) and you will get less {flamage} for it.  Limits which
        are round numbers in base 10 are always especially suspect.
     
        [{Jargon File}]