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We found 29 dictionaries with English definitions that include the word weaken:
Click on the first link on a line below to go directly to a page where "weaken" is defined.

General (27 matching dictionaries)

1. weaken: Merriam-Webster.com [home, info]
2. weaken: Oxford Dictionaries [home, info]
3. weaken: American Heritage Dictionary of the English Language [home, info]
4. weaken: Collins English Dictionary [home, info]
5. weaken: Vocabulary.com [home, info]
6. weaken: Macmillan Dictionary [home, info]
7. Weaken, weaken: Wordnik [home, info]
8. weaken: Cambridge Advanced Learner's Dictionary [home, info]
9. weaken: Wiktionary [home, info]
10. weaken: Webster's New World College Dictionary, 4th Ed. [home, info]
11. weaken: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. weaken: Infoplease Dictionary [home, info]
13. weaken: Dictionary.com [home, info]
14. weaken: UltraLingua English Dictionary [home, info]
15. weaken: Cambridge Dictionary of American English [home, info]
16. Weaken: Online Plain Text English Dictionary [home, info]
17. weaken: Webster's Revised Unabridged, 1913 Edition [home, info]
18. weaken: Rhymezone [home, info]
19. Weaken: AllWords.com Multi-Lingual Dictionary [home, info]
20. weaken: Webster's 1828 Dictionary [home, info]
21. weaken: Free Dictionary [home, info]
22. weaken: Mnemonic Dictionary [home, info]
23. weaken: WordNet 1.7 Vocabulary Helper [home, info]
24. weaken: LookWAYup Translating Dictionary/Thesaurus [home, info]
25. weaken: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

26. weaken: Legal dictionary [home, info]

Computing (1 matching dictionary)

27. weaken: Encyclopedia [home, info]

(Note: See weakens for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (weaken) ▸ verb:  become weaker ("The prisoner's resistance weakened after seven days") ▸ verb:  lessen the strength of ("The fever weakened his body") ▸ verb:  reduce the level or intensity or size or scope of ▸ verb:  lessen in force or effect ▸ verb:  destroy property or hinder normal operations ▸ Also see weakens ▸ Words similar to weaken ▸ Usage examples for weaken ▸ Words that often appear near weaken ▸ Rhymes of weaken ▸ Invented words related to weaken