Longman Dictionary of Contemporary English homepage

unprecedented

 adjective
     
un‧pre‧ce‧dent‧ed
never having happened before, or never having happened so much:
He took the unprecedented step of stating that the rumours were false.
Crime has increased on an unprecedented scale.
unprecedented in
an event that is unprecedented in recent history
—unprecedentedly adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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