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English definition of “assurance”

assurance

noun [C/U]  /əˈʃʊər·əns/ us  
a promise to tell something to someone confidently or firmly, or a promise to cause someone to feel certain by removing doubt: [C] He gave me his assurance that he would give us an answer by the end of the week. Assurance is also a feeling of confidence in your abilities: [U] She answered all the questions put to her with assurance and poise.
(Definition of assurance from the Cambridge Academic Content Dictionary © Cambridge University Press)
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