simple past tense and past participle of rule on

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

(idiomatic, transitive) To consider (something) as a possible option among others.

(obsolete, intransitive) To revel.

(obsolete) Revelry.

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.

(law, transitive) To make a decision in an official capacity regarding some matter.