What is the meaning of Reign?

The exercise of sovereign power.

The period during which a monarch rules.

The territory or sphere over which a kingdom; empire; realm; dominion, etc. is ruled.

To exercise sovereign power, to rule as a monarch.

To reign over (a country)

To be the winner of the most recent iteration of a competition.

To be a dominant quality of a place or situation; to prevail, predominate, rule.

Source: wiktionary.org