What is the meaning of regulation?

noun

• An authoritative rule.
  • synonyms: ordinance
• A principle or condition that customarily governs behavior.
  • usage: "it was his rule to take a walk before breakfast"; "short haircuts were the regulation"
  • synonyms: rule
• 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.
  • synonyms: regularization, regularisation
• The act of controlling or directing according to rule.
  • usage: "fiscal regulations are in the hands of politicians"
  • synonyms: regulating

adjective

• Prescribed by or according to regulation.
  • usage: "regulation army equipment"