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We found 12 dictionaries with English definitions that include the word needn't:
Click on the first link on a line below to go directly to a page where "needn't" is defined.

General (12 matching dictionaries)

1. needn't: Merriam-Webster.com [home, info]
2. needn't: Oxford Dictionaries [home, info]
3. needn't: American Heritage Dictionary of the English Language [home, info]
4. needn't, needn't: Collins English Dictionary [home, info]
5. neednt: Macmillan Dictionary [home, info]
6. Needn't, need'nt, needn't, neednt, neednt: Wordnik [home, info]
7. needn't: Cambridge Advanced Learner's Dictionary [home, info]
8. needn't: Wiktionary [home, info]
9. needn't: Webster's New World College Dictionary, 4th Ed. [home, info]
10. needn't, neednt: Dictionary.com [home, info]
11. neednt: Cambridge Dictionary of American English [home, info]
12. needn't: Dictionary/thesaurus [home, info]

Quick definitions from Wiktionary (needn't) ▸ verb:  (chiefly British, formal, or literary) Need not (negative auxiliary). ▸ Words similar to needn't ▸ Usage examples for needn't ▸ Words that often appear near needn't ▸ Rhymes of needn't ▸ Invented words related to needn't