We found 35 dictionaries that define the word stiffness:

General (20 matching dictionaries)

1. stiffness: Merriam-Webster
2. stiffness: Oxford Learner's Dictionaries
3. stiffness: Collins English Dictionary
4. stiffness: Vocabulary.com
5. Stiffness, stiffness: Wordnik
6. stiffness: Cambridge Advanced Learner's Dictionary
7. stiffness: Wiktionary
8. stiffness: Dictionary.com
9. stiffness: Cambridge Essential American English Dictionary
10. Stiffness (mathematics), Stiffness: Wikipedia, the Free Encyclopedia
11. Stiffness: Online Plain Text English Dictionary
12. stiffness: Webster's Revised Unabridged, 1913 Edition
13. stiffness: Rhymezone
14. Stiffness: AllWords.com Multi-Lingual Dictionary
15. stiffness: Webster's 1828 Dictionary
16. stiffness: FreeDictionary.org
17. stiffness: Mnemonic Dictionary
18. stiffness: TheFreeDictionary.com

Art (1 matching dictionary)

19. English-Chinese Dictionary of Graphic Communications (Big 5) (No longer online)

Business (3 matching dictionaries)

20. Construction Term Glossary (No longer online)
21. stiffness: Legal dictionary
22. BusinessDictionary.com (No longer online)

Computing (1 matching dictionary)

23. stiffness: Encyclopedia

Medicine (3 matching dictionaries)

24. stiffness: Merriam-Webster Medical Dictionary
25. Stiffness: Merck Manuals
26. stiffness: Medical dictionary

Miscellaneous (1 matching dictionary)

27. stiffness: Idioms

Sports (1 matching dictionary)

28. Internet Karting Glossary (No longer online)

Tech (5 matching dictionaries)

29. Book Binding (No longer online)
30. AUTOMOTIVE TERMS (No longer online)
31. Glossary of Composite Terms (No longer online)
32. K & A glossary (No longer online)
33. Paper Making (No longer online)

(Note: See stiff as well.)

Definitions from Wiktionary (stiffness) ▸ noun:  Rigidity or a measure of rigidity. ▸ noun:  Inflexibility or a measure of inflexibility. ▸ noun:  Inelegance; a lack of relaxedness. ▸ noun:  Muscular tension due to unaccustomed or excessive exercise or work; soreness. Similar: hardness, severity, harshness, awkwardness, clumsiness, inclemency, gracelessness, rigidness, rigidity, firmness, more... Opposite: flexibility, pliability, suppleness, elasticity, limberness Phrases: Stiffness matrix, joint stiffness, morning stiffness, Neck stiffness, range stiffness, more... Adjectives: joint, high, torsional, relative, certain, elastic, greater, lateral, low, dynamic, initial ▸ Words similar to stiffness ▸ Usage examples for stiffness ▸ Idioms related to stiffness ▸ Wikipedia articles (New!) ▸ Popular adjectives describing stiffness ▸ Words that often appear near stiffness ▸ Rhymes of stiffness ▸ Invented words related to stiffness