Quindecennial

adj

adj ·Rare ·Advanced level

Definitions

Adjective
  1. 1
    Lasting fifteen years. not-comparable
  2. 2
    Happening once in fifteen years. not-comparable

Synonyms

All synonyms
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Etymology

From Latin quindecennialis, from quindecennium (“15-year period”) + -alis (“-al: forming adjs”). Equivalent to quindec- + -ennial.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.