- The definition of a frater is a brother in a fraternity.
An example of a frater is a member of Sigma Alpha Epsilon.
frater definition by Webster's New World
Origin: Middle English freitour ; from Anglo-French fraitur, aphetic for Old French refreitor, refeitor ; from Midieval Latin refectorium
- a brother or comrade, esp. as in a fraternity
- Obsolete a friar
Origin: Classical Latin literally , brother