ad extremumyoudaoicibaDictYouDict[ad extremum 词源字典]
"To the ultimate extent or degree; excessively", Mid 17th cent.; 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 etymology, ad extremum origin, 英语词源]