"reigning" in the verb sense
have sovereign power
"Henry VIII reigned for a long time"
2. predominate, dominate, rule, reign, prevail
be larger in number, quantity, power, status or importance
"Money reigns supreme here"
"Hispanics predominate in this neighborhood"
"reigning" in the adjective sense
1. regnant, reigning, ruling
exercising power or authority
Source: WordNet® (An amazing lexical database of English)
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