Federative a. : Uniting in a league; forming a confederacy; federal.

Example:
In a Federative Republic government, what rights do the people have?

Taxonomy
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Defination from the web:
federative from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... or formed by federation <a federative republic> — fed·er·a·tive·ly adverb. Learn more about "federative" with Google Search >> Custom Search ...