Real Dictionary

puritan
Puritan attitudes are based on strict moral or religious principles and often involve disapproval of physical pleasures.
countable noun: The Puritans were a group of English Protestants in the sixteenth and seventeenth centuries who lived in a very strict and religious way.
countable noun: You describe someone as a puritan when they live according to strict moral or religious principles, especially when they disapprove of physical pleasures.

Puritan in American English
any member of a Protestant group in England and the American colonies that in the 16th and 17th cent., wanted to make the Church of England simpler in its services and stricter about morals
of the Puritans or Puritanism
adjective: of or pertaining to the Puritans
noun: a member of a group of Protestants that arose in the 16th century within the Church of England, demanding the simplification of doctrine and worship, and greater strictness in religious discipline: during part of the 17th century the Puritans became a pow

puritan in British English
adjective: characteristic of a puritan
noun: a person who adheres to strict moral or religious principles, esp one opposed to luxury and sensual enjoyment

Puritan in British English (in the late 16th and 17th centuries)
adjective: of, characteristic of, or relating to the Puritans
noun: any of the more extreme English Protestants, most of whom were Calvinists, who wished to purify the Church of England of most of its ceremony and other aspects that they deemed to be Catholic