leveller

noun

1. (usually initial capital letter) (during the British Civil War) a member of the Parliamentary army advocating constitutional reforms, equal rights, and religious tolerance.
2. Chiefly British. leveler.

noun

1. a person or thing that levels.

noun

1. a person or thing that levels
2. a person who works for the abolition of inequalities

n.1590s, someone or something that makes level; agent noun of level (v.). From 1640s as the name of a political party of the time of Charles I that advocated abolishing all differences of position and rank.