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We found 47 dictionaries with English definitions that include the word necessary:
Click on the first link on a line below to go directly to a page where "necessary" is defined.

General (32 matching dictionaries)

1. necessary: Wikimedia Commons US English Pronunciations [home, info]
2. necessary, the necessary: Merriam-Webster.com [home, info]
3. necessary, necessary: Oxford Dictionaries [home, info]
4. necessary: American Heritage Dictionary of the English Language [home, info]
5. necessary, the necessary: Collins English Dictionary [home, info]
6. necessary: Vocabulary.com [home, info]
7. necessary, necessary: Macmillan Dictionary [home, info]
8. Necessary, necessary: Wordnik [home, info]
9. necessary: Cambridge Advanced Learner's Dictionary [home, info]
10. Necessary, necessary: Wiktionary [home, info]
11. necessary: Webster's New World College Dictionary, 4th Ed. [home, info]
12. necessary: The Wordsmyth English Dictionary-Thesaurus [home, info]
13. necessary: Infoplease Dictionary [home, info]
14. Necessary, necessary: Dictionary.com [home, info]
15. necessary: Online Etymology Dictionary [home, info]
16. necessary: UltraLingua English Dictionary [home, info]
17. necessary: Cambridge Dictionary of American English [home, info]
18. necessary: Cambridge International Dictionary of Idioms [home, info]
19. Necessary (song), Necessary: Wikipedia, the Free Encyclopedia [home, info]
20. Necessary: Online Plain Text English Dictionary [home, info]
21. necessary: Webster's Revised Unabridged, 1913 Edition [home, info]
22. necessary: Rhymezone [home, info]
23. necessary: AllWords.com Multi-Lingual Dictionary [home, info]
24. necessary: Webster's 1828 Dictionary [home, info]
25. necessary: Free Dictionary [home, info]
26. necessary: Hutchinson Dictionaries [home, info]
27. necessary: Mnemonic Dictionary [home, info]
28. necessary: WordNet 1.7 Vocabulary Helper [home, info]
29. Necessary, necessary: LookWAYup Translating Dictionary/Thesaurus [home, info]
30. necessary: Dictionary/thesaurus [home, info]

Business (3 matching dictionaries)

31. Necessary (logic), necessary: Legal dictionary [home, info]
32. Necessary (logic), Necessary: Financial dictionary [home, info]
33. necessary: Law.com Dictionary [home, info]

Computing (1 matching dictionary)

34. Necessary (logic), Necessary (modal logic), necessary: Encyclopedia [home, info]

Medicine (3 matching dictionaries)

35. necessary: Medical dictionary [home, info]
36. necessary: online medical dictionary [home, info]
37. Necessary (logic): Medical dictionary [home, info]

Miscellaneous (4 matching dictionaries)

38. necessary: Idioms [home, info]
39. NECESSARY: Navajo Code Talkers' Dictionary [home, info]
40. NECESSARY: Acronym Finder [home, info]
41. necessary: Glosario de términos filosóficos (en inglés) [home, info]

Science (3 matching dictionaries)

42. necessary: FOLDOP - Free On Line Dictionary Of Philosophy [home, info]
43. Necessary: Eric Weisstein's World of Mathematics [home, info]
44. necessary: PlanetMath Encyclopedia [home, info]

Slang (1 matching dictionary)

45. necessary: Urban Dictionary [home, info]

(Note: See necessaries for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (necessary) ▸ noun:  anything indispensable ▸ adjective:  absolutely essential ▸ adjective:  unavoidably determined by prior circumstances ("The necessary consequences of one's actions") ▸ name:  A surname (very rare: popularity rank in the U.S.: #26227) ▸ Also see necessaries ▸ Word origin ▸ Words similar to necessary ▸ Usage examples for necessary ▸ Popular adjectives describing necessary ▸ Popular nouns described by necessary ▸ Words that often appear near necessary ▸ Rhymes of necessary ▸ Invented words related to necessary