What does "commoner" mean?

Additional senses

1. 2.One who has a joint right in common ground. Much good land might be gained from forests . . . and from other commonable places, so as always there be a due care taken that the poor commoners have no injury. Bacon.
2. 3.One sharing with another in anything. [Obs.] Fuller.
3. 4.A student in the university of Oxford, Eng., who is not dependent on any foundation for support, but pays all university charges; -- at Cambrige called a pensioner.
4. 5.A prostitute. [Obs.] Shak.