That rules; predominant; chief; reigning; controlling.

An order or a decision on a point of law from someone in authority.

present participle and gerund of rule

plural of ruling

present participle of rule on

The rules are certain and cannot be ignored or worked around.

(slang, nonstandard) Alternative form of rules are rules

A regulation, law, guideline. / A regulating principle. / The act of ruling; administration of law; government; empire; authority; control. / A normal condition or state of affairs.

(transitive, stative) To regulate, be in charge of, make decisions for, reign over. / (slang, intransitive, stative) To excel. / (intransitive) To decide judicially.

(obsolete) Revelry.