regulation (n.)

1670s, "act of regulating; state of being reduced to order," noun of action from regulate. Meaning "a rule for management prescribed by a superior or competent authority" is from 1715. As an adjective, "having a fixed pattern; in accord with a rule or standard," by 1836. Related: Regulations.

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Definitions of regulation from WordNet
regulation (n.)
an authoritative rule;
Synonyms: ordinance
regulation (n.)
a principle or condition that customarily governs behavior;
short haircuts were the regulation
Synonyms: rule
regulation (n.)
the state of being controlled or governed;
regulation (n.)
(embryology) the ability of an early embryo to continue normal development after its structure has been somehow damaged or altered;
regulation (n.)
the act of bringing to uniformity; making regular;
Synonyms: regularization / regularisation
regulation (n.)
the act of controlling or directing according to rule;
fiscal regulations are in the hands of politicians
Synonyms: regulating
regulation (adj.)
prescribed by or according to regulation;
regulation army equipment