We found 14 dictionaries that define the word donkey's years:

General (11 matching dictionaries)

1. donkey's years: Merriam-Webster
2. donkey's years: Oxford Learner's Dictionaries
3. donkey's years, donkey's years: Collins English Dictionary
4. donkey's years: Wordnik
5. donkey's years: Cambridge Advanced Learner's Dictionary
6. donkey's years: Wiktionary
7. donkey's years: Infoplease Dictionary
8. donkey's years, donkeys years: Dictionary.com
9. Donkey's Years, Donkeys' Years: Wikipedia, the Free Encyclopedia
10. donkey's years, donkeys years: TheFreeDictionary.com
11. Donkey's years: World Wide Words

Miscellaneous (1 matching dictionary)

12. donkey's years: Idioms

Slang (2 matching dictionaries)

13. Donkey's years: Dublin Slang and Phrasebook
14. Donkey's years: Urban Dictionary

Definitions from Wiktionary (donkey's years) ▸ noun:  (UK, Ireland, Commonwealth, idiomatic) A long time, years and years. ▸ Words similar to donkey's years ▸ Usage examples for donkey's years ▸ Idioms related to donkey's years ▸ Wikipedia articles (New!) ▸ Words that often appear near donkey's years ▸ Rhymes of donkey's years ▸ Invented words related to donkey's years