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  1. Dictionary
    fast·ness
    /ˈfastnəs/

    noun

    • 1. a secure refuge, especially a place well protected by natural features: "a remote Himalayan mountain fastness"
    • 2. the ability of a material or dye to maintain its color without fading or washing away: "the dyes differ in their fastness to light"

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    More definitions, origin and scrabble points

  2. www.merriam-webster.com › dictionary › fastnessFastness Definition & Meaning - Merriam-Webster

    The meaning of FASTNESS is the quality or state of being fast. How to use fastness in a sentence.

  3. dictionary.cambridge.org › dictionary › englishFASTNESS | English meaning - Cambridge Dictionary

    FASTNESS definition: 1. how fast (= fixed) something is: 2. a safe place, such as a fortress: 3. how fast (= fixed…. Learn more.

  4. www.dictionary.com › browse › fastnessFASTNESS Definition & Meaning | Dictionary.com

    Fastness definition: a secure or fortified place; stronghold. See examples of FASTNESS used in a sentence.

  5. dictionary.cambridge.org › us › dictionaryFASTNESS | definition in the Cambridge English Dictionary

    FASTNESS meaning: 1. how fast (= fixed) something is: 2. a safe place, such as a fortress: 3. how fast (= fixed…. Learn more.

  6. www.thefreedictionary.com › fastnessFastness - definition of fastness by The Free Dictionary

    Define fastness. fastness synonyms, fastness pronunciation, fastness translation, English dictionary definition of fastness. n. 1. The condition or quality of being fast, especially: a. Firmness; security. b. Rapidity; swiftness. 2. The quality or condition of color retention;...

  7. www.vocabulary.com › dictionary › fastnessFastness - Definition, Meaning & Synonyms | Vocabulary.com

    Definitions of fastness. noun. a rate (usually rapid) at which something happens. synonyms: speed, swiftness. see more. noun. the quality of being fixed in place as by some firm attachment. synonyms: fixedness, fixity, fixture, secureness. see more.

  8. www.collinsdictionary.com › dictionary › englishFASTNESS definition and meaning | Collins English Dictionary

    A fastness is a place, such as a castle, which is considered safe because it is difficult to reach or easy to defend against attack. [ literary ] They could have withdrawn into the mountain fastness of Eryri.

  9. en.wiktionary.org › wiki › fastnessfastness - Wiktionary, the free dictionary

    Jun 2, 2024 · fastness ( countable and uncountable, plural fastnesses) ( uncountable) The quality or state of being fast ( in various senses ). The quality or state of being strongly attached; firmness, secureness, tenacity . (specifically) The ability of a dye to withstand fading.

  10. www.oxfordlearnersdictionaries.com › definition › englishfastness noun - Definition, pictures, pronunciation and usage...

    Definition of fastness noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

  11. www.ldoceonline.com › dictionary › fastnessfastness | meaning of fastness in Longman Dictionary of...

    fastness meaning, definition, what is fastness: a place that is safe because it is diffi...: Learn more.