(historical) The four top Allied powers of World War I and their leaders: David Lloyd George of Britain, Georges Clemenceau of France, Vittorio Emanuele Orlando of Italy and Woodrow Wilson of the United States, who met at the Paris Peace Conference in 1919 at Versailles.
Synonyms:Council of Four, The Four Nations
A group of four entrepreneurs who formed the Central Pacific Railroad.
(music) A jazz rhythm derived from the marching band beat.
Any group of four major or largest corporations in a given industry, especially when such a small group has oligopoly or near-oligopoly.
(finance) The four largest banks in any of various countries, or (internationally) the Federal Reserve, People's Bank of China, Bank of Japan, and European Central Bank.
2023 October 30, Kevin Peachey, “Big banks accused of doing little for savers”, in BBC News (news), BBC:
Banks have been reporting their results in recent days, with HSBC the latest to reveal higher profits. It is one of the so-called big four, which also includes Barclays, Lloyds and NatWest. ¶ In response. Harriett Baldwin, who chairs the Treasury Committee, said: "The big four banks have been far too slow to reward savers through better rates on instant access savings accounts."
(finance, business, technology) The four largest corporations of Big Tech during the 2000s–2020s, usually defined as Alphabet (f.k.a. Google), Meta (f.k.a. Facebook), Amazon, and Apple.
Synonym:Gang of Four
(business, accounting) The four largest global auditing firms, comprising Deloitte, Ernst & Young (EY), KPMG, and PwC.
2023 November 4, Stephen Foley, Michael O'Dwyer, “Engineer pulls off structural change to lead Big Four firm”, in FT Weekend, London: The Financial Times Ltd., →ISSN, →OCLC, page13: