Definition of fraternal
1a
: of, relating to, or involving brothers
fraternal love
b
: of, relating to, or being a fraternity or society
a fraternal order a fraternal chapter house
2
: derived from two ova : dizygotic
fraternal twins
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Merriam-Webster unabridged
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Time Traveler for fraternal
The first known use of fraternal was in the 15th century
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