quindecennial

[ kwin-di-sen-ee-uhl ]

adjective

1. of or relating to a period of 15 years or the 15th occurrence of a series, as an anniversary.

noun

1. a 15th anniversary.

quindecennial

/ ˌkwɪndɪˈsɛnɪəl /

adjective

1. occurring once every 15 years or over a period of 15 years

noun

1. a 15th anniversary

Word History and Origins

Origin of quindecennial¹

< Latin quīndec ( im ) fifteen + -ennial (as in decennial )

Word History and Origins

Origin of quindecennial¹

C20: from Latin quindecim fifteen + annus year, on the model of biennial