progressive
US /prəˈɡres.ɪv/
UK /prəˈɡres.ɪv/

1.
happening or developing gradually or in stages; proceeding step by step
:
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The disease showed a progressive decline in health.
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The company made progressive improvements in its product line.
2.
favoring or implementing social reform or new, liberal ideas
:
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She is known for her progressive views on education.
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The party adopted a more progressive stance on environmental issues.
1.
a person who favors or implements social reform or new, liberal ideas
:
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She is a true progressive, always advocating for change.
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The new mayor is seen as a progressive by many.