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Definition unprecedented in British English

unprecedented adjective

adjective
/ʌnˈpresɪˌdentɪd/
1

never having happened or existed before

Example

The government took the unprecedented step of releasing confidential correspondence.

Synonyms and related words
1.1

the greatest in size, amount, degree etc that has ever been known

Example

The flood waters have risen to unprecedented levels.

Synonyms and related words
Definition unprecedented in British English