Adjective
/ˌənˈpresəˌdəntid/,

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Never done or known before,
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Never done or known before
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the government took the unprecedented step of releasing confidential correspondence
Web Definitions:
- having no precedent; novel; "an unprecedented expansion in population and industry"
- (unprecedentedly) in an unprecedented manner
- Never before seen or done, without precedent
- "The belief that President Obama is so special that everything he does or says must be admired."