<p><strong>Noun</strong></p><ul><li>plural fraternities.</li><li>a local or national organization of male students, primarily for social purposes, usually with secret initiation and rites and a name composed of two or three Greek letters.</li><li>a group of persons associated by or as if by ties of brotherhood.</li><li>any group or class of persons having common purposes, interests, etc.: the medical fraternity.</li><li>an organization of laymen for religious or charitable purposes; sodality.</li><li>the quality of being brotherly; brotherhood: liberty, equality, and fraternity.</li><li>the relation of a brother or between brothers.</li></ul>