Origin: 1400-1500 Medieval Latin fraternalis, from Latin frater brother
1showing a special friendliness to other people because you share interests or ideas with them: a fraternal spirit among the workers2[only before noun] relating to an organization formed of people who share interests: a fraternal organization3relating to brothers: fraternal loyalty [Origin: 1400–1500 Medieval Latin fraternalis, from Latin frater brother]—fraternally adverb