Nefastus
A Dictionary of Law · Henry Campbell Black · 1891
A Dictionary of Law
Lat. Inauspicious. Applied, in the Roman law, to a day on which it was unlawful to open the courts or administer justice. Negatio conclusionis ost error in lege.
Wing. 268.
The denial of a conclusion ig error in law. Negatio destruit negationem, et ambe faciunt affirmationem. A negative destroys a negative, and both make an affirmative.
Co. Litt. 1466.
Lord Coke cites this as a rule of grammatical construction, not always applying in law. Negatio duplex est affirmatio A double negative is an affirmative.