Black's Law Dictionary (2nd edition)dictionaries

Memorandum

Lat. To he remembered ; he it remembered. A formal word with which the body of a record in the court of king’s beuch ancientiy commenced. Townsh. Pl. 486 ; 2 Tldd, Pr. 719. The whole clause is now, in practice, termed, from this iuitial word, the “memorandum,” and lts use is sup-posed to have originated from the circum-stance that proceedings “by bill” (in which alone it has been employed) were formerly considered as the by-business of the court. Gilb. Com. Pl. 47, 48

Source: Black’s Law Dictionary 2nd Ed (1910)