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fra·ter·nal (frə-tûŕnəl)

[Middle English, from Old French fraternel, from Medieval Latin frāternālis, from Latin frāternus, from frāter, brother.]

adjective 

    1. Of or relating to brothers: a close fraternal tie.
    2. 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.

derivatives

fra·teŕnal·ism
noun
fra·teŕnal·ly
adverb