quasquicentennial

quasquicentennial [kwos-kwi-sen-ten-ee-uh l] Word Origin adjective

1. pertaining to or marking a period of 125 years.

noun

2. a 125th anniversary.
3. a celebration marking such an anniversary.

Origin of quasquicentennial quasqui- one and a quarter (pseudo-Latin, apparently qua(dri-) + (se)squi-) + centenial