Meaning of “rule” - Learner’s Dictionary

rule

verb [ I, T ] uk us /ruːl/
DECIDE

to make an official legal decision:

[ + (that) ] The judge ruled that it was wrong for a 16-year-old girl to be held in an adult prison.
CONTROL

B2 to be in control of somewhere, usually a country:

[ often passive ] They were ruled for many years by a dictator.
the ruling party
→ See also rule the roost

(Definition of “rule verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)