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English definition of “firmness”

firmness

noun [U] (CERTAINTY)    /ˈfɜːm.nəs/ US  /ˈfɝːm-/
the quality of being certain and not likely to changeCertaintyConfidence and self-assurance
(Definition of firmness noun (CERTAINTY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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