1530s, verbal noun from nurse (v.) in any sense. Specific meaning "profession of one who nurses the sick or injured" is from 1860 (Florence Nightingale).
Italian family that ruled Florence during the 15c., originally the plural of medico "a physician," from Latin medicus (see medical (adj.)). Related: Medicean.
[A]n illustrious family of Florence, appearing first as merchants of the medieval republic, and at the dawn of the Renaissance, in the fifteenth century, raised to supreme power through their liberality and merit. From this time on for three centuries, amid fortunes of varying brilliancy, this family produced popes, sovereigns, and tyrants, and it occupies a large place in the history of Europe. In the fine arts and literature the epithet has particular reference to Cosimo dei Medici, known as Cosimo the Elder, and to Lorenzo the Magnificent. [Century Dictionary]
1796, from Italian Accademia della Crusca, literally "Academy of the Chaff," "the name of an Academy established at Florence in 1582, mainly with the object of sifting and purifying the Italian language; whence its name, and its emblem, a sieve" [OED]. From della "of the" (from Latin de "of" + illa "that") + crusca "bran." Related: Della-Cruscan.
early 15c., "uninterrupted connection of parts in space or time," from Old French continuité, from Latin continuitatem (nominative continuitas) "a connected series," from continuus "joining, connecting with something; following one after another," from continere (intransitive) "to be uninterrupted," literally "to hang together" (see contain).
Cinematographic sense, in reference to assuring there are no discrepancies of detail in linked scenes filmed at different times, is recorded by 1919, American English. It was originally especially women's work.
The scenario,—that is the division of the synopsis into scenes from which the picture is made—is written by men and women specially trained for the work. Women are as successful, perhaps more so, in this line than men. The average price for an original motion picture synopsis is from $500 to $1500, but the price may be higher or lower according to the company and the value of the author's name. ... Continuity writers or those who divide the story into the scenes (continuity and scenario being different names for the same thing) are specially well paid. [Helen Christene Hoerle and Florence B. Saltzberg, "The Girl and the Job," New York, 1919]