1.
a member of a group of Protestants in 16th- and 17th-century England and 17th-century America who believed in strict religious discipline and called for the simplification of acts of worship
2.
somebody who lives by a strict moral or religious code, especially somebody who is suspicious of pleasure
3.
someone who has strict moral or religious principles, and does not approve of pleasure, for example in sexual activity, entertainment, or eating and drinking