Megacorporation, mega-corporation, or megacorp, a term originally coined by Alfred Eichner in his book The Megacorp and Oligopoly: Micro Foundations of Macro Dynamics but popularized by William Gibson,
derives from the combination of the prefix mega- with the word corporation. It has become widespread in cyberpunk literature. It is synonymous with syndicate, globalist- or transnational capital. It refers to a corporation (normally fictional) that is a massive conglomerate (usually private), holding monopolistic or near-monopolistic control over multiple markets (thus exhibiting both a horizontal and a vertical monopoly). Megacorps are so powerful that they are above the government laws, possess their own heavily armed (often military-sized) private armies, are operators of privatized police forces, hold "sovereign" territory, and even act as outright governments. They often exercise a large degree of control over their employees, taking the idea of "corporate culture" to an extreme.
Such organizations as a staple of science fiction long predate cyberpunk, appearing in the works of writers such as Philip K. Dick (Do Androids Dream of Electric Sheep?, 1968), Thea von Harbou (Metropolis, 1927), Robert A. Heinlein (Citizen of the Galaxy, 1957), Robert Asprin (The Cold Cash War, 1977), and Andre Norton (the Solar Queen novels). The explicit use of the term in the Traveller science fiction roleplaying game from 1977 predates Gibson's use of it. The transnationals, and later metanationals in Kim Stanley Robinson’s Mars Trilogy are an example of mega corporations that exceed most countries in political influence.
In the Alien film franchise characters are repeatedly manipulated and endangered by the unscrupulous megacorporation Weyland-Yutani, which seeks to profit from the Aliens.
In the animated Pixar film WALL-E, the megacorporation Buy n' Large has completely supplanted every planetary government.
In the Avatar series of films, the Resources Development Administration (RDA) is a megacorporation that outmatches most governments in wealth, influence, and military power.