1a. Of or relating to brothers: a close fraternal tie.b. Showing comradeship; brotherly. 2. Of or constituting a fraternity: a fraternal association.3.Biology Of, relating to, or being a twin developed from two separately fertilized ova; dizygotic.
ETYMOLOGY:
Middle English, from Old French fraternel, from Medieval Latin frternlis, from Latin frternus, from frter, brother. See bhrter- in Appendix I.