1. One who does not conform to, or refuses to be bound by, accepted beliefs, customs, or practices.
2. often Nonconformist A member of a Protestant church not observing the doctrines, usage, or polity of a national or established church, especially the Church of England.

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.