(1)To refer in a general way to officials who make all the important decisions in a country, use the authorities or persons who exercise (administrative) control over others: ‘The authorities have entered issued a curfew.’ As a countable noun, authority refers to an official group or organization that controls an area or activity: ‘You can claim housing benefit from your local authority.’ (2) The power or right to give orders or make decisions: ‘He has the authority to issue warrants.’
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