The definition of a frater is a brother in a fraternity.
An example of a frater is a member of Sigma Alpha Epsilon.
Obs. the eating room, or refectory, in a monastery
Origin of fraterMiddle English freitour from Anglo-French fraitur, aphetic for Old French refreitor, refeitor from Medieval Latin refectorium
- a brother or comrade, esp. as in a fraternity
- Obs. a friar
Origin of fraterL, literally , brother