Definition of "megacorp"

In the period following World War II, the diversification strategy became a more common one for megacorps, the technique being refined so that expansion was no longer limited to industries with a similar technology.

1980, Glenn Porter, Encyclopedia of American economic history: volume 2

The gel is a genetically-engineered bioplasm created by the Sirta Foundation, a medical technology megacorp based on Earth. Technically, medi-gel violates Council laws against genetic engineering, but so far, it has proved far too useful to ban.

2008, BioWare, Mass Effect (Science Fiction), Redwood City: Electronic Arts, PC, scene: Medi-Gel Codex entry

If he were alive to study these changes, I think he would have focused his attention on how these changes affect the investment behavior of megacorps, for it is through investment that megacorps are able to grow over time.

2009, Marc Lavoie, Louis-Philippe Rochon, Mario Seccareccia, Money and Macrodynamics: Alfred Eichner and Post-Keynesian Economics, page 99