We found 13 dictionaries that define the word Roman numerals:

General (9 matching dictionaries)

1. Roman numerals: Merriam-Webster
2. Roman numerals: Collins English Dictionary
3. Roman numerals: Vocabulary.com
4. Roman numerals: Cambridge Advanced Learner's Dictionary
5. Roman numerals: Wiktionary
6. Roman numerals: Infoplease Dictionary
7. Roman numerals: Dictionary.com
8. Roman Numerals, Roman numerals, The Roman Numerals: Wikipedia, the Free Encyclopedia
9. Roman numerals: TheFreeDictionary.com

Computing (1 matching dictionary)

10. Roman numerals: Encyclopedia

Science (2 matching dictionaries)

11. Roman Numerals: Eric Weisstein's World of Mathematics
12. Roman numerals: PlanetMath Encyclopedia

Tech (1 matching dictionary)

13. Book Binding (No longer online)

(Note: See roman_numeral as well.)

Definitions from Wiktionary (Roman numerals) ▸ noun:  (uncountable) The system of numerals using Roman numerals. Similar: ordinal numeral, numericlature, number, cardinal numeral, decimal system, numeromancy, numeronym, radix, numeral, hexavigesimal, more... Types: I, V, X, L, C, D, M, more... ▸ Words similar to Roman numerals ▸ Usage examples for Roman numerals ▸ Idioms related to Roman numerals ▸ Wikipedia articles (New!) ▸ Words that often appear near Roman numerals ▸ Rhymes of Roman numerals ▸ Invented words related to Roman numerals