regulation regulation /ˌrɛgjəˈleɪʃən/

adjective

1. () Prescribed by or according to regulation  ( regulation )
   prescribed by or according to regulation
    Regulation army equipment
   regulation army equipment
   

noun

1. () An authoritative rule  ( ordinance , regulation )
   an authoritative rule
     The government implemented new regulations to improve public safety.
   The government implemented new regulations to improve public safety.
   
2. () A principle or condition that customarily governs behavior  ( regulation , rule )
   a principle or condition that customarily governs behavior
    It was his rule to take a walk before breakfast
   it was his rule to take a walk before breakfast
    Short haircuts were the regulation
   short haircuts were the regulation
   
3. The act of controlling or directing according to rule  ( regulating , regulation )
   the act of controlling or directing according to rule
    Fiscal regulations are in the hands of politicians
   fiscal regulations are in the hands of politicians
   
4. The act of bringing to uniformity; making regular  ( regularisation [British] , regularization , regulation )
   the act of bringing to uniformity; making regular
   
5. (embryology) the ability of an early embryo to continue normal development after its structure has been somehow damaged or altered  ( regulation )
   (embryology) the ability of an early embryo to continue normal development after its structure has been somehow damaged or altered
   
6. The state of being controlled or governed  ( regulation )
   the state of being controlled or governed