- a secret association engaged in organized crime in the U.S., modeled after and affiliated with the Mafia.
Origin of Cosa Nostra
1960–65; < Italian: literally, our affair
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- the branch of the Mafia that operates in the US
Italian, literally: our thing
Word Origin and History for cosa nostra
1963, "the Mafia in America," from Italian, literally "this thing of ours."
Online Etymology Dictionary, © 2010 Douglas Harper