bimillennial
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bi·mil·len·ni·um
(bī′mə-lĕn′ē-əm)n. pl. bi·mil·len·ni·ums or bi·mil·len·ni·a (-lĕn′ē-ə)
1. A span of 2,000 years.
2. A 2,000th anniversary.
bi′mil·len′ni·al adj.
bi′mil·len′ni·al·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
bimillennial
(ˌbaɪmɪˈlɛnɪəl)adj
relating to a bimillennium
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014