We found 9 dictionaries that define the word overachieving:

General (8 matching dictionaries)

1. overachieving: Merriam-Webster
2. overachieving: Oxford Learner's Dictionaries
3. overachieving: Collins English Dictionary
4. overachieving: Vocabulary.com
5. Overachieving, overachieving: Wordnik
6. overachieving: Wiktionary
7. overachieving: Dictionary.com
8. overachieving: TheFreeDictionary.com

Medicine (1 matching dictionary)

9. overachieving: Merriam-Webster Medical Dictionary

(Note: See overachieve as well.)

Definitions from Wiktionary (overachieve) ▸ verb:  To achieve more or at a higher level of quality than was expected. ▸ Also see overachieve Types: ambitious, diligent, hardworking, conscientious, zealous, persevering, more... ▸ Words similar to overachieving ▸ Usage examples for overachieving ▸ Idioms related to overachieving ▸ Wikipedia articles (New!) ▸ Words that often appear near overachieving ▸ Rhymes of overachieving ▸ Invented words related to overachieving