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Learn to pronounce 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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The meaning of FASTNESS is the quality or state of being fast. How to use fastness in a sentence.
FASTNESS meaning: 1. how fast (= fixed) something is: 2. a safe place, such as a fortress: 3. how fast (= fixed…. Learn more.
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noun. a secure or fortified place; stronghold: a mountain fastness. the state of being fixed or firm: the fastness of democratic institutions.
​a place that is thought to be safe because it is difficult to get to or easy to defend synonym stronghold. a mountain fastness; The enemy retreated to ...
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the quality of being fixed in place as by some firm attachment. synonyms: fixedness, fixity, fixture, secureness. see moresee less. antonyms: looseness.
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4 senses: 1. a stronghold; fortress 2. the state or quality of being firm or secure 3. the ability of a dye to remain permanent.
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(countable) Something that is fast, or that causes someone or something to be fast (in various senses).
Fastness definition: The condition or quality of being fast, especially:.
: a place that is difficult to get to or that can be easily defended if it is attacked. a remote mountain fastness [=stronghold, fortress]
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a secure or fortified place; stronghold: a mountain fastness. ; the state of being fixed or firm: the fastness of democratic institutions. ; the state of being ...
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