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We found 30 dictionaries with English definitions that include the word strengthen:
Click on the first link on a line below to go directly to a page where "strengthen" is defined.

General (27 matching dictionaries)

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

Business (1 matching dictionary)

26. strengthen: Legal dictionary [home, info]

Computing (1 matching dictionary)

27. strengthen: Encyclopedia [home, info]

Medicine (1 matching dictionary)

28. strengthen: online medical dictionary [home, info]

(Note: See strengthens for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (strengthen) ▸ verb:  gain strength ("His body strengthened") ▸ verb:  make strong or stronger ("This exercise will strengthen your upper body") ▸ verb:  give a healthy elasticity to ▸ Also see strengthens ▸ Words similar to strengthen ▸ Usage examples for strengthen ▸ Idioms related to strengthen (New!) ▸ Words that often appear near strengthen ▸ Rhymes of strengthen ▸ Invented words related to strengthen