from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Happening once every 20 years.
  • adj. Existing or lasting for 20 years.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Occurring every twenty years.
  • adj. Lasting twenty years.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Lasting or comprising twenty years.
  • adj. Happening once in twenty years.

from The Century Dictionary and Cyclopedia

  • Lasting or continuing twenty years: as, a vicennial charter or license.
  • Happening once in twenty years: as, a vicennial commemoration.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. occurring once every 20 years


From Late Latin vīcennium, period of twenty years : Latin vīciēns, twenty times (from vīgintī, twenty; see vicenary) + Latin annus, year; see at- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)


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