quindecennial

十五年期间 a. 每十五年发生一次的, 持续十五年的

释义与例句

adj.
  1. 1.

    Lasting fifteen years.

  2. 2.

    Happening once in fifteen years.

词源

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

来源：wiktionary