quasquicentennial
adjective
- one-hundred-and-twenty-fifth anniversary
Wiktionary
adj
Etymology: From quasqui- (“quarter”) + centennial, from Latin quadrāns (“quarter”) or Latin quārtus (“fourth”).
- Relating to a period of 125 years.
noun
Etymology: From quasqui- (“quarter”) + centennial, from Latin quadrāns (“quarter”) or Latin quārtus (“fourth”).
- A 125th anniversary.
- A celebration to mark such an anniversary.