Top Definition
An intense emotional relationship between two heterosexual males that, while non-sexual in nature, exceeds the boundaries of a traditional bromance.
A year after pledging the same fraternity, Harry and Gabe reached a state of fraternal matrimony and became the envy of their fellow brothers.

Fraternal matrimony is legal in California.
by King Bro July 01, 2009
5 Words related to Fraternal matrimony

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