regulation

adjective

1
the act of controlling or directing according to rule
fiscal regulations are in the hands of politicians
2
the act of bringing to uniformity; making regular
3
a principle or condition that customarily governs behavior
it was his rule to take a walk before breakfast
short haircuts were the regulation
4
an authoritative rule
5
(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

Also useful for “regulation”:Crossword— A long fill for tough grids