Definition of "Regulation" :

noun: the act of controlling or directing according to rule

"Fiscal regulations are in the hands of politicians."

noun: the act of bringing to uniformity; making regular

noun: a principle or condition that customarily governs behavior

"Short haircuts were the regulation."

noun: an authoritative rule

noun: (embryology) the ability of an early embryo to continue normal development after its structure has been somehow damaged or altered

noun: the state of being controlled or governed

adjective: prescribed by or according to regulation

"Regulation army equipment."