NOUN (5)

1. the condition naturally attaching to life in the country;

2. the construction of masonry or brickwork in a rustic manner;

3. the action of retiring to and living in the country;

4. temporary dismissal of a student from a university;

5. banishment into the country;

The Collaborative International Dictionary of English v.0.48:

Rustication \Rus`ti*ca"tion\, n. [L. rusticatio.]
   1. The act of rusticating, or the state of being rusticated;
      specifically, the punishment of a student for some
      offense, by compelling him to leave the institution for a
      time.
      [1913 Webster]

   2. (Arch.) Rustic work.
      [1913 Webster]

WordNet (r) 3.0 (2006):

rustication
    n 1: the condition naturally attaching to life in the country
    2: the construction of masonry or brickwork in a rustic manner
    3: the action of retiring to and living in the country
    4: temporary dismissal of a student from a university
    5: banishment into the country