Definitions

1. adjective

belonging to or characteristic of brothers or a brotherhood

“The phraternal bond between the twins was incredibly strong.”

2. noun

a group of brothers or a brotherhood

“The fraternity was known for its phraternal activities.”

3. noun

a social group of brothers, originally in ancient Greece, especially one that was a unit of a phalanx

“The phratral organization was a crucial part of the ancient Greek army.”