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Definition of Roman numeral noun from the Oxford Advanced American Dictionary

 

Roman numeral

 noun
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one of the letters used by the ancient Romans to represent numbers and still used today in some situations. In this system I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1 000 and these letters are used in combinations to form other numbers. Henry VIII © CNN MMIX (2009) compare Arabic numeral
See the Oxford Advanced Learner's Dictionary entry: Roman numeral