1. To rule like a monarch: Everyone hopes that King Charles II will reign for a very long time.
2. To be a dominant condition of a situation or an area: Finally, after reaching the cemetery, Jill enjoyed the peace and quiet that reigned among the graves.
3. To exhibit the power or success of a person in a regions or situation: In the newspaper there was an article about a woman who reigned as a sex symbol and had a great mansion and lots of money.