quindecennial
English
Etymology
From Latin quindecennialis, from quindecennium (“15-year period”) + -alis (“-al: forming adjs”). Equivalent to quindec- + -ennial.
Adjective
quindecennial (not comparable)
- Lasting fifteen years.
- Happening once in fifteen years.
Further reading
- “quindecennial”, in OneLook Dictionary Search.