commoner

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One of the common people.
• noun A person without noble rank or title.

from The Century Dictionary.

• noun One of the common people; a member of the commonalty.
• noun Specifically A person inferior in rank to the nobility; one of the commons.
• noun A member of the British House of Commons.
• noun A member of a common council; a common-councilman.
• noun One who has a joint right in common ground.
• noun A student of the second rank in the University of Oxford, not dependent on the foundation for support, but paying for his board and eating at the common table: corresponding to a pensioner at Cambridge.
• noun One who boards in commons.
• noun A prostitute.
• noun A partaker; one sharing with another.

from the GNU version of the Collaborative International Dictionary of English.

• noun One of the common people; one having no rank of nobility.
• noun A member of the House of Commons.
• noun One who has a joint right in common ground.
• noun obsolete One sharing with another in anything.
• noun A student in the university of Oxford, Eng., who is not dependent on any foundation for support, but pays all university charges; - - at Cambridge called a pensioner.
• noun obsolete A prostitute.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective comparative form of common: more common
• noun A member of the common people who holds no title or rank.
• noun UK Someone who is not of noble rank.
• noun UK, at Oxbridge universities An undergraduate who does not hold either a scholarship or an exhibition.
• noun obsolete, UK A student who is not dependent on any foundation for support, but pays all university charges; at Cambridge called a pensioner.
• noun Someone holding common rights because of residence or land ownership in a particular manor, especially rights on common land.
• noun obsolete One sharing with another in anything.
• noun obsolete A prostitute.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a person who holds no title