from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Once every eleven years; undecennial.
from the GNU version of the Collaborative International Dictionary of English
- adj. Occurring once in every period of eleven years; undecennial.
from The Century Dictionary and Cyclopedia
- Eleventh; occurring once in every period of eleven years.
Sorry, no etymologies found.
Cool word of the day: undecennary, which means "a period of eleven years" or "an eleventh anniversary."
Japanese-American internment: the US army announced that it would no longer hold Japanese-Americans in Harold Holt: the Australian prime minister went missing and was presumed drowned while swimming off the coast of UFOs was terminated; the conclusion was that sightings were due to mass hysteria, hoaxes, mistakes and the like (1969) undecennary