Definition of: fraternity

(frə·tûr′nə·tē) noun plural ·ties
1. The condition or relation of brotherhood; brotherly affection.
2. An organization, for social or other purposes, of men students of American colleges, usually having Greek letter names and secret rites, and represented by chapters in many in stitutions.
3. A similar organization outside of colleges.
4. A group of men of the same profession, sporting interests, etc.: the medical fraternity.