The Mafia (also known as Cosa Nostra) is a Sicilian criminal society which is believed to have emerged in late 19th century Sicily, and the first such society to be referred to as a mafia. It is a loose association of criminal groups that share a common organizational structure and code of conduct. Each group, known as a "family", "clan" or "cosca", claims sovereignty over a territory in which it operates its rackets - usually a town or village or a neighborhood of a larger city.

Offshoots of the Mafia emerged in the United States and in Australia during the late 19th century following waves of Sicilian and Southern Italian emigration (see Italian-American Mafia).

Etymology

There are several theories about the origin of the term "Mafia" (sometimes spelt "Maffia" in early texts). The Sicilian adjective mafiusu may derive from the slang Arabic mahyas (مهياص), meaning "aggressive boasting, bragging", or marfud meaning "rejected". Roughly translated, it means "swagger", but can also be translated as "boldness, bravado". In reference to a man, mafiusu in 19th century Sicily was ambiguous, signifying a bully, arrogant but also fearless, enterprising, and proud, according to scholar Diego Gambetta.This etymology is based on the books Mafioso by Gaia Servadio; The Sicilian Mafia by Diego Gambetta; and Cosa Nostra by John Dickie (see Books]] below).

The public's association of the word with the criminal secret society was perhaps inspired by the 1863 play "I mafiusi di la Vicaria" ("The Mafiosi of the Vicaria") by Giuseppe Rizzotto and Gaetano Mosca. The words Mafia and mafiusi are never mentioned in the play; they were probably put in the title to add a local flair. The play is about a Palermo prison gang with traits similar to the Mafia: a boss, an initiation ritual, and talk of "umirtà" ("humility") and "pizzu" (a codeword for [[protection money). The play had great success throughout Italy. Soon after, the use of the term "mafia" began appearing in the Italian state's early reports on the phenomenon. The word made its first official appearance in 1865 in a report by the prefect of Palermo, Filippo Antonio Gualterio.Lupo, Storia della Mafia, p. 6

Leopoldo Franchetti, an Italian deputy who travelled to Sicily and who wrote one of the first authoritative reports on the mafia in 1876, saw the Mafia as an "industry of violence" and described the designation of the term "mafia":

"the term mafia found a class of violent criminals ready and waiting for a name to define them, and, given their special character and importance in Sicilian society, they had the right to a different name from that defining vulgar criminals in other countries."Gambetta, The Sicilian Mafia, p. 137