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What was the first operating system to be called an "operating system"?

The operating system for the Dartmouth Time Sharing System in 1967 was known as the executive. Nowadays it would be known as a kernel.
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What was the first operating system to be called an "operating system"?

Though the following two systems don't refer to themselves as operating systems, they are control systems for early computers -- Lyons Eectronic Office (LEO) in the UK, implemented in 1951 and ...
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What was the first operating system to be called an "operating system"?

As is often the case, a candidate for the first system to be described by its authors as an “operating system” is the Atlas supervisor, described in the eponymous paper published in December 1961, ...
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