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We found 17 dictionaries with English definitions that include the word on earth:
Click on the first link on a line below to go directly to a page where "on earth" is defined.

General (16 matching dictionaries)

1. on earth: Merriam-Webster.com [home, info]
2. on earth: Oxford Learner's Dictionaries [home, info]
3. on earth: Collins English Dictionary [home, info]
4. on earth: Vocabulary.com [home, info]
5. on earth: Wordnik [home, info]
6. on earth, on Earth: Wiktionary [home, info]
7. On earth, on earth: Dictionary.com [home, info]
8. on earth: UltraLingua English Dictionary [home, info]
9. On Earth: Wikipedia, the Free Encyclopedia [home, info]
10. on earth: Rhymezone [home, info]
11. on earth: Free Dictionary [home, info]
12. on earth: Mnemonic Dictionary [home, info]
13. on earth: LookWAYup Translating Dictionary/Thesaurus [home, info]
14. on earth: Dictionary/thesaurus [home, info]

Miscellaneous (1 matching dictionary)

15. on earth: Idioms [home, info]

Quick definitions from WordNet (on earth) ▸ adverb:  used with question words to convey surprise ("What on earth are you doing?") ▸ Words similar to on earth ▸ Usage examples for on earth ▸ Idioms related to on earth (New!) ▸ Words that often appear near on earth ▸ Rhymes of on earth ▸ Invented words related to on earth