quasquicentennial means relating to a period of 125 years. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Etymology
From quasqui- (“quarter”) + centennial, from Latin quadrāns (“quarter”) or Latin quārtus (“fourth”).
adj
- Relating to a period of 125 years.
noun
- A 125th anniversary.
- A celebration to mark such an anniversary.