- 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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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