definition of
regulation

[1] #1 regulation n. [ordinance] an authoritative rule. wn

[2] #2 regulation n. [rule] a principle or condition that customarily governs behavior; "it was his rule to take a walk before breakfast"; "short haircuts were the regulation". wn

[3] #3 regulation s. prescribed by or according to regulation; "regulation army equipment". wn

[4] #4 regulation n. the state of being controlled or governed. wn

[5] #5 regulation n. (embryology) the ability of an early embryo to continue normal development after its structure has been somehow damaged or altered. wn