A Puritan of 16th and 17th century England was an associate of any number of religious groups advocating for more "purity" of worship and doctrine, as well as personal and group piety. Puritans felt that the English Reformation had not gone far enough, and that the Church of England was tolerant of practices which they associated with the Church of Rome. The word "Puritan" was originally an alternate term for "Cathar" and was a pejorative used to characterize them as extremists similar to the Cathari of France. The Puritans sometimes cooperated with presbyterians, who put forth a number of proposals for "further reformation" in order to keep the Church of England more closely in line with the Reformed Churches on the Continent.
Rev. C. Arthur Lane Illustrated Notes on English Church History (London: Society for Promoting Christian Knowledge, 1901)