quin·de·cen·ni·al (kw n d-s n  - l)adj. 1. Occurring once every 15 years. 2. Lasting 15 years. n. A 15th anniversary. [From Latin qu  ndecim, fifteen; see penkwe in Indo-European roots + Latin -ennium (from annus, year; see at- in Indo-European roots).] |
quindecennial [ˌkwɪndɪˈsɛnɪəl]
adj
n occurring once every 15 years or over a period of 15 years
a 15th anniversary
[from Latin quindecim fifteen + annus year, on the model of biennial]
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