regulation

an authoritative rule

a principle or condition that customarily governs behavior; "it was his rule to take a walk before breakfast"; "short haircuts were the regulation"

the state of being controlled or governed

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

the act of bringing to uniformity; making regular

the act of controlling or directing according to rule; "fiscal regulations are in the hands of politicians"

prescribed by or according to regulation; "regulation army equipment"