Simple Definition of Roman numeral
: one of the letters that were used by the ancient Romans to represent numbers and that are still used today
Full Definition of Roman numeral
: a numeral in a system of notation that is based on the ancient Roman system — see number table
Examples of roman numeral in a sentence
In Roman numerals “X” is equal to the number 10.
First Known Use of roman numeral
Seen and Heard
What made you want to look up Roman numeral? Please tell us where you read or heard it (including the quote, if possible).