Usually means: Required for a specific purpose.
Definitions Related words Phrases (New!) Mentions Lyrics History
We found 41 dictionaries that define the word necessary:

General (26 matching dictionaries)
  1. necessary, the necessary: Merriam-Webster.com
  2. necessary, necessary: Oxford Learner's Dictionaries
  3. necessary: American Heritage Dictionary of the English Language
  4. necessary, the necessary: Collins English Dictionary
  5. necessary: Vocabulary.com
  6. Necessary, necessary: Wordnik
  7. necessary: Cambridge Advanced Learner's Dictionary
  8. Necessary, necessary: Wiktionary
  9. necessary: Webster's New World College Dictionary, 4th Ed.
  10. necessary: The Wordsmyth English Dictionary-Thesaurus
  11. necessary: Infoplease Dictionary
  12. Necessary, necessary: Dictionary.com
  13. necessary: Online Etymology Dictionary
  14. necessary: Cambridge Essential American English Dictionary
  15. Necessary (song), Necessary: Wikipedia, the Free Encyclopedia
  16. Necessary: Online Plain Text English Dictionary
  17. necessary: Webster's Revised Unabridged, 1913 Edition
  18. necessary: Rhymezone
  19. necessary: AllWords.com Multi-Lingual Dictionary
  20. necessary: Webster's 1828 Dictionary
  21. necessary: Free Dictionary
  22. necessary: Mnemonic Dictionary
  23. necessary: Dictionary/thesaurus
  24. necessary: Wikimedia Commons US English Pronunciations

Business (3 matching dictionaries)
  1. necessary: Law.com Dictionary
  2. Necessary (logic), necessary: Legal dictionary
  3. Necessary (logic), Necessary: Financial dictionary

Computing (1 matching dictionary)
  1. Necessary (logic), Necessary (modal logic), necessary: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. Necessary (logic), necessary: Medical dictionary

Miscellaneous (4 matching dictionaries)
  1. Navajo Code Talkers' Dictionary (No longer online)
  2. NECESSARY: Acronym Finder
  3. necessary: Glosario de términos filosóficos (en inglés)
  4. necessary: Idioms

Science (3 matching dictionaries)
  1. Necessary: Eric Weisstein's World of Mathematics
  2. necessary: PlanetMath Encyclopedia
  3. FOLDOP - Free On Line Dictionary Of Philosophy (No longer online)

Slang (2 matching dictionaries)
  1. necessary: Green’s Dictionary of Slang
  2. necessary: Urban Dictionary

(Note: See necessaries as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Required, essential, whether logically inescapable or needed in order to achieve a desired result or avoid some penalty.
adjective:  Unavoidable, inevitable.
adjective:  (obsolete) Determined, involuntary: acting from compulsion rather than free will.
noun:  (chiefly UK, Rhode Island, Massachusetts, Maine, archaic, euphemistic, usually with the definite article) A place to do the "necessary" business of urination and defecation: an outhouse or lavatory.
noun:  (obsolete) Necessity.
noun:  A surname.

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