Definitions

from The Century Dictionary.

  • Belonging or relating to a period of eleven years; occurring or observed every eleven years, or every eleventh year: as, an undecennial festival.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Occurring or observed every eleventh year; belonging to, or continuing, a period of eleven years; undecennary.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Occurring or observed every eleventh year.

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