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What does MACOS stand for?

MACOS stands for Macintosh Operating System

This definition appears very frequently

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Samples in periodicals archive:

Federighi has managed the Macintosh operating system team for two years and this summer's release of the latest version of the software, called Lion, should be "seamless," according to, joined Apple in 1997 and has been involved with releases of Tiger, Leopard, and Snow Leopard versions of Macintosh operating software.
Those using the Macintosh operating system can now create and deliver questions in PowerPoint with an add-in module.
In the release, Microsoft Announces Mac OS X Drivers Available for Entire Hardware Line, issued earlier today, we are advised by the company that the fourth graph, second sentence, should read, "The new keyboard driver will work with the Macintosh operating system OS X, versions 10.
Macworld Conference & Expo, a comprehensive tradeshow event for the Macintosh operating system, brings together a diverse base of Macintosh users in creative services, education, entertainment, application development, enterprise and small office/home office environments.
The shakeup is the latest blow to the troubled computer company, which has seen its Macintosh sales tumble amid product problems, doubts about the future and worries about a replacement for the aging Macintosh operating system.