What is the meaning of Monarch?

The ruler of an absolute monarchy or the head of state of a constitutional monarchy.

A monarch butterfly (Danaus plexippus) and others of genus Danaus, found primarily in North America.

A police officer.

A stag which has sixteen or more points or tines on its antlers.

The chief or best thing of its kind.

Any bird of the family Monarchidae.

monarch

Source: wiktionary.org