Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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Arabic numeral any of the symbols for the numbers one through nine, including zero; 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9.
Roman numeral any of the letters I, V, X, L, C, D, or M, used in the Roman system of notation, in which a letter followed by one of equal or lesser value indicates addition of the two, a letter followed by one of greater value indicates that the first is to be subtracted from the second, and a bar over a letter multiplies it by 1,000.