One of the mysteries of the English language finally explained.
To a sufficient extent; moderately, only as much as required. In later use chiefly Science.
Late 17th century (in an earlier sense). From post-classical Latin quantum sufficit as much as suffices (3rd cent.; from 1565 in medical prescriptions) from quantum which amount + sufficit, 3rd singular present indicative of sufficere.
quantum sufficit/ˌkwɒntəm ˈsʌfɪsɪt/
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