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English definition of “flat”

flat

adjective [before noun] (COMPLETE)    /flæt/ (flatter, flattest)
complete or certain , and not likely to change : His request for time off work was met with a flat refusal . The minister has issued a flat denial of the accusations against her.CertaintyConfidence and self-assurance
(Definition of flat adjective (COMPLETE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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