Usually means: Resistance to fading or deterioration.
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We found 29 dictionaries that define the word fastness:

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

Art (1 matching dictionary)
  1. English-Chinese Dictionary of Graphic Communications (Big 5) (No longer online)

Business (1 matching dictionary)
  1. fastness: Legal dictionary

Computing (1 matching dictionary)
  1. fastness: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Slang (1 matching dictionary)
  1. fastness: Urban Dictionary

Tech (1 matching dictionary)
  1. Fastness: Dictionary of Military Architecture

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (uncountable) The quality or state of being fast (in various senses).
noun:  The quality or state of being strongly attached; firmness, secureness, tenacity.
noun:  (specifically) The ability of a dye to withstand fading.
noun:  The quality or state of moving quickly; quickness, rapidity, swiftness.
noun:  The quality or state of having an extravagant lifestyle or immoral habits.
noun:  (archaic) Of a fortress or other place: the quality or state of being secure from access or attack; safety, security.
noun:  (obsolete) The quality or state of being firm, hard, or solid; firmness, hardness, solidity.
noun:  (countable) Something that is fast, or that causes someone or something to be fast (in various senses).
noun:  (also figuratively) A fortified or secure place; a fortress, a stronghold.
noun:  (obsolete except British, regional) Something used to fasten or tie; a fastener or fastening.

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