Perfectionists, an American sect or society founded by John Humphrey Noyes in 1848 at Oneida, New York State, on Communistic principles, but owning no law save that of the Spirit, and subject to no criticism but the judgment they freely passed on one another, a system which they were obliged to modify in 1880 so far as to recognise the rights of matrimony and the family, and to adopt the principle of a joint-stock limited liability company, on which lines the community is proving a prosperous one.