What is the definition of community?

* com·mu·ni·ty (n., pl. com·mu·ni·ties. Abbr. com.)
1. a. A group of people living in the same locality and under the same government.
   b. The district or locality in which such a group lives.
2. A group of people having common interests: the scientific community; the international business community.
3. a. Similarity or identity: a community of interests.
   b.Sharing, participation, and fellowship.
4. Society as a whole; the public.