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English definition of “fastness”

fastness

noun uk   /ˈfɑːst.nəs/ us    /ˈfæst-/

fastness noun (FIXED)

[U] how fast (= fixed) something is: Test clothes for colour fastness before washing.

fastness noun (SAFE PLACE)

[C] literary a safe place, such as a fortress: a mountain fastness
(Definition of fastness from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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