One of the mysteries of the English language finally explained.
To the ultimate extent or degree; excessively.
Mid 17th century; earliest use found in John Sadler (1615–1674), political theorist and reformer. From classical Latin ad extremum at or to the end from ad at, to + extrēmum (accusative), use as noun of neuter of extrēmus.
ad extremum/ˌad ɛkˈstreɪməm//ˌad ɪkˈstriːməm/
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