meliorist (noun)

1. The meliorist artist used their paintings to criticize societal hierarchies and advocate for equality.

2. The protagonist in the novel was a meliorist, constantly striving to improve the world and bring about change.

3. In the science fiction story, the meliorist character fought against an oppressive regime and worked towards creating a better future for all.

4. The meliorist movement of the 19th century aimed to reform social and political institutions during the Industrial Revolution.