Source : Webster's Revised Unabridged Dictionary (1913)

Regulation \Reg`u*la"tion\ (-l?"sh?n), n.
   1. The act of regulating, or the state of being regulated.

            The temper and regulation of our own minds.
                                                  --Macaulay.

   2. A rule or order prescribed for management or government;
      prescription; a regulating principle; a governing
      direction; precept; law; as, the regulations of a society
      or a school.

   {Regulation sword}, {cap}, {uniform}, etc. (Mil.), a sword,
      cap, uniform, etc., of the kind or quality prescribed by
      the official regulations.

   Syn: {Law}; rule; method; principle; order; precept. See
        {Law}.

Source : WordNet®

regulation
     adj : prescribed by or according to regulation; "regulation army
           equipment"
     n 1: an authoritative rule [syn: {ordinance}]
     2: a principle or condition that customarily governs behavior;
        "it was his rule to take a walk before breakfast"; "short
        haircuts were the regulation" [syn: {rule}]
     3: the state of being controlled or governed
     4: (embryology) the ability of an early embryo to continue
        normal development after its structure has been somehow
        damaged or altered
     5: the act of bringing to uniformity; making regular [syn: {regularization},
         {regularisation}]
     6: the act of controlling or directing according to rule;
        "fiscal regulations are in the hands of politicians" [syn:
         {regulating}]