We found 30 dictionaries that define the word unnecessary:

General (24 matching dictionaries)

1. unnecessary: Longman Dictionary of Contemporary English
2. unnecessary: Merriam-Webster
3. unnecessary, unnecessary: Oxford Learner's Dictionaries
4. unnecessary: American Heritage Dictionary of the English Language
5. unnecessary: Collins English Dictionary
6. unnecessary: Vocabulary.com
7. Unnecessary, unnecessary: Wordnik
8. unnecessary: Cambridge Advanced Learner's Dictionary
9. unnecessary: Wiktionary
10. unnecessary: Webster's New World College Dictionary, 4th Ed.
11. unnecessary: The Wordsmyth English Dictionary-Thesaurus
12. unnecessary: Infoplease Dictionary
13. unnecessary: Dictionary.com
14. unnecessary: Online Etymology Dictionary
15. unnecessary: Cambridge Essential American English Dictionary
16. Unnecessary: Wikipedia, the Free Encyclopedia
17. unnecessary: Rhymezone
18. unnecessary: Webster's 1828 Dictionary
19. unnecessary: FreeDictionary.org
20. unnecessary: Mnemonic Dictionary
21. unnecessary: TheFreeDictionary.com
22. unnecessary: Wikimedia Commons US English Pronunciations

Business (2 matching dictionaries)

23. unnecessary: Legal dictionary
24. unnecessary: Financial dictionary

Computing (1 matching dictionary)

25. unnecessary: Encyclopedia

Medicine (1 matching dictionary)

26. unnecessary: Medical dictionary

Slang (2 matching dictionaries)

27. unnecessary: Green’s Dictionary of Slang
28. unnecessary: Urban Dictionary

Definitions from Wiktionary ( ) ▸ adjective:  Not needed or necessary. ▸ adjective:  Done in addition to requirements; unrequired. Similar: needless, unneeded, uncalled-for, gratuitous, inessential, extra, supererogatory, supernumerary, superfluous, redundant, more... Opposite: essential, crucial, vital, necessary, indispensable Types: air conditioner, dehumidifier, microwave, refrigerator, air purifier, air filter, air freshener, more... Phrases: unnecessary hardship, unnecessary procedures, make unnecessary, Churchill, Hitler and the Unnecessary War, Unnecessary health care, more... Colors:     beige,     taupe,     mauve,     chartreuse,     puce, more... ▸ Word origin ▸ Words similar to unnecessary ▸ Usage examples for unnecessary ▸ Idioms related to unnecessary ▸ Wikipedia articles (New!) ▸ Popular nouns described by unnecessary ▸ Words that often appear near unnecessary ▸ Rhymes of unnecessary ▸ Invented words related to unnecessary