We found 19 dictionaries that define the word First World War:

General (16 matching dictionaries)

1. First World War, first world war: Merriam-Webster
2. First World War: Oxford Learner's Dictionaries
3. First World War: American Heritage Dictionary of the English Language
4. First World War: Collins English Dictionary
5. First World War: Vocabulary.com
6. the First World War, the First World war: Cambridge Advanced Learner's Dictionary
7. First World War: Wiktionary
8. first world war: Dictionary.com
9. First World War, First World war, First world war, The First World War (TV series), The First World War: Wikipedia, the Free Encyclopedia
10. First world war: Rhymezone
11. first world war: FreeDictionary.org
12. first world war: Mnemonic Dictionary
13. First World War: TheFreeDictionary.com
14. first world war: Longman Dictionary of Contemporary English
15. First World War: Merriam-Webster

Business (1 matching dictionary)

16. First World War, The First World War: Legal dictionary

Computing (1 matching dictionary)

17. First World War, The First World War: Encyclopedia

Slang (1 matching dictionary)

18. The first world war: Urban Dictionary

(Note: See first_world_wars as well.)

Definitions from Wiktionary (First World War) ▸ noun:  World War I. Similar: Great War, World War I, war to end war, European War, world, First World, lost generation, Old World, west, War Between the States, more... Opposite: World War II, Second World War, WWII Phrases: the first world war, History of the United Kingdom during the First World War, British infantry brigades of the First World War, British Army during the First World War, more... ▸ Words similar to First World War ▸ Usage examples for First World War ▸ Idioms related to First World War ▸ Wikipedia articles (New!) ▸ Words that often appear near First World War ▸ Rhymes of First World War ▸ Invented words related to First World War