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English definition of “firmness”

firmness

noun [U] (HARDNESS)    /ˈfɜːm.nəs/ US  /ˈfɝːm-/
the quality of not being soft, but not completely hard: The bed's firmness suited him.Hard and firm
(Definition of firmness noun (HARDNESS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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