Commoner

n.
  1. One of the common people; one having no rank of nobility.
  2. A member of the House of Commons.
  3. One who has a joint right in common ground.
  4. One sharing with another in anything.
  5. 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.
  6. A prostitute.