What does XXI stand for?

What does XXI mean? This page is about the various possible meanings of the acronym, abbreviation, shorthand or slang term: XXI.

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XXI

Roman Numeral 21

Academic & Science » Mathematics

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What does XXI mean?

twenty-one, 21, XXI(adj)
the cardinal number that is the sum of twenty and one

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"XXI." Abbreviations.com. STANDS4 LLC, 2015. Web. 19 Apr. 2015. <http://www.abbreviations.com/XXI>.