Roman Numeral Definition
noun
Any of the numerical symbols formed with the Roman letters I, V, X, L, C, D, and M, representing respectively the numbers 1, 5, 10, 50, 100, 500, and 1,000, used by the ancient Romans and still used today in certain formal contexts.
American Heritage
(in the plural) The system using such letters.
Wiktionary
Antonyms:
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