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English definition of “fastness”

fastness

noun [U] (FIXED)    /ˈfɑːst.nəs/ US  /ˈfæst-/
how fast (= fixed) something is: Test clothes for colour fastness before washing.Keeping and staying the sameNot able to be changed
(Definition of fastness noun (FIXED) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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