Definition of Roman numeral
: a numeral in a system of notation that is based on the ancient Roman system — see Table of Numbers
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“Roman numeral.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Roman%20numeral. Accessed 28 Jun. 2022.
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Time Traveler for Roman numeral
The first known use of Roman numeral was circa 1638
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