We found 26 dictionaries that define the word invalidity:

General (20 matching dictionaries)

1. invalidity: Merriam-Webster
2. invalidity: Oxford Learner's Dictionaries
3. invalidity: Collins English Dictionary
4. invalidity: Vocabulary.com
5. Invalidity, invalidity: Wordnik
6. invalidity: Cambridge Advanced Learner's Dictionary
7. invalidity: Wiktionary
8. invalidity: Infoplease Dictionary
9. invalidity: Dictionary.com
10. Invalidity: Online Plain Text English Dictionary
11. invalidity: Webster's Revised Unabridged, 1913 Edition
12. invalidity: Rhymezone
13. Invalidity: AllWords.com Multi-Lingual Dictionary
14. invalidity: Webster's 1828 Dictionary
15. invalidity: FreeDictionary.org
16. invalidity: Mnemonic Dictionary
17. invalidity: TheFreeDictionary.com
18. invalidity: Longman Dictionary of Contemporary English

Business (3 matching dictionaries)

19. invalidity: Merriam-Webster Legal Dictionary
20. Glossary of Legal Terms (No longer online)
21. invalidity: Legal dictionary

Computing (1 matching dictionary)

22. invalidity: Encyclopedia

Medicine (2 matching dictionaries)

23. invalidity: Merriam-Webster Medical Dictionary
24. invalidity: Medical dictionary

(Note: See invalidities as well.)

Definitions from Wiktionary ( ) ▸ noun:  The state of being invalid; lack of validity. Similar: invalidness, invalidhood, nonvalidity, invalidation, invalidship, invalidism, invalidcy, validness, validity, illegitimation, more... Opposite: validity, legitimacy, authenticity, credibility, veracity Types: unsound, fallacious, inapplicable, illogical, incorrect, irrelevant, more... Phrases: invalidity benefit, more... Adjectives: partial, internal, such, external, constitutional, possible, alleged, permanent, total, formal, legal ▸ Words similar to invalidity ▸ Usage examples for invalidity ▸ Idioms related to invalidity ▸ Wikipedia articles (New!) ▸ Popular adjectives describing invalidity ▸ Words that often appear near invalidity ▸ Rhymes of invalidity ▸ Invented words related to invalidity