A right-wing dictatorship (sometimes also referred to as a rightist dictatorship) is an authoritarian (or sometimes totalitarian) regime following right-wing policies. There are various definitions of the term "rightist", the most common being "conservative" or "reactionary". Those are often to some degree pro-market in economic matters and conservative in social ones. The Estado Novo in Portugal was a right-wing dictatorship which was corporatist in nature. Most South American dictatorships during the second half of the 20th century were right-wing, with the most notable being the regimes of Augusto Pinochet in Chile, Brazil's military dictatorship and Argentina's military dictatorship. There have also been a number of military dictatorships installed by anti-communists and anti-leftists