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an·ti-fed·er·al·ist | \ ˌan-tē-ˈfe-d(ə-)rə-list, ˌan-ˌtī- 
\
\Definition of anti-federalist
: a person who opposed the adoption of the U.S. Constitution
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Time Traveler for anti-federalist
The first known use of anti-federalist was in 1787
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