What is "semicentennial"

Semicentennial \Sem`i*cen*ten"ni*al\, a. Of or pertaining to half of a century, or a period of fifty years; as, a semicentennial commemoration.

Semicentennial \Sem`i*cen*ten"ni*al\, n. A fiftieth anniversary.

a. Occurring every 50 years n. A 50th anniversary.

1. adj. of or relating to or marking the 50th anniversary [syn: semicentenary]

2. n. the 50th anniversary (or the celebration of it) [syn: semicentenary]