Roman numeral
noun
- any of the letters representing numbers in the Roman numerical system: Ⅰ= 1, Ⅴ = 5, X = 10, L = 50, C = 100, D = 500, M = 1,000. In this system a letter placed after another of greater value adds (thus ⅩⅥ or xvi is 16) , whereas a letter placed before another of greater value subtracts (thus XC is 90).罗马数字。