vicennial

vi·cen·ni·al

happening every twenty years
lasting twenty years

Origin of vicennial

Late Latin vicennialis from Classical Latin vicennium, period of twenty years from vicies, twenty times + annus, year (see annual)

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MLA Style

"vicennial." YourDictionary, n.d. Web. 14 January 2019. <https://www.yourdictionary.com/vicennial>.

APA Style

vicennial. (n.d.). Retrieved January 14th, 2019, from https://www.yourdictionary.com/vicennial

vicennial

adjective

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

Origin of vicennial

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.

THE AMERICAN HERITAGE® DICTIONARY OF THE ENGLISH LANGUAGE, FIFTH EDITION by the Editors of the American Heritage Dictionaries. Copyright © 2016, 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.