noun
A person who works actively to make a positive difference in the world, typically through social or political action.
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The young entrepreneur was recognized as a changemaker in the business community.
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She's always coming up with new ideas and making things happen - a real changemaker.
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That guy is a total changemaker, always shaking things up and getting stuff done.
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In the world of art, the painter was considered a changemaker for introducing a new style of painting.