We found 20 dictionaries that define the word overreaction:

General (15 matching dictionaries)

1. overreaction: Merriam-Webster
2. overreaction: Oxford Learner's Dictionaries
3. overreaction: Collins English Dictionary
4. overreaction: Vocabulary.com
5. Overreaction, overreaction: Wordnik
6. overreaction: Cambridge Advanced Learner's Dictionary
7. overreaction: Wiktionary
8. overreaction: Dictionary.com
9. overreaction: Cambridge Essential American English Dictionary
10. Overreaction: Wikipedia, the Free Encyclopedia
11. overreaction: Rhymezone
12. overreaction: FreeDictionary.org
13. overreaction: Mnemonic Dictionary
14. overreaction: TheFreeDictionary.com
15. overreaction: Wikimedia Commons US English Pronunciations

Business (1 matching dictionary)

16. Overreaction: Investopedia

Medicine (3 matching dictionaries)

17. overreaction: Merriam-Webster Medical Dictionary
18. Overreaction: MedFriendly Glossary
19. overreaction: Medical dictionary

Slang (1 matching dictionary)

20. overreaction: Urban Dictionary

(Note: See overreactions as well.)

Definitions from Wiktionary (overreaction) ▸ noun:  A reaction that is excessive. Similar: hyperreaction, overresponse, overreactivity, overstatement, overaction, overcorrection, overactivation, overseverity, overexaggeration, overestimation, more... Opposite: underreaction, restraint, moderation Phrases: overreaction hypothesis, more... Adjectives: emotional, such, gross, hysterical, parental, extreme, american, violent, own, massive, possible ▸ Words similar to overreaction ▸ Usage examples for overreaction ▸ Idioms related to overreaction ▸ Wikipedia articles (New!) ▸ Popular adjectives describing overreaction ▸ Words that often appear near overreaction ▸ Rhymes of overreaction ▸ Invented words related to overreaction