
1) Concept in physics 2) Four-dimensional system 3) Web browser 4) Windows web browser
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https://www.crosswordclues.com/clue/spacetime
[software] SpaceTime (also known as SpaceTime3D) is a 3D graphical user interface that displays web pages in a 3d tabbed stack. The interface is available as online as a flash application, or as a free desktop software download for the Microsoft Windows operating system. The technology was presented at the 2008 CES tradeshow. ==History== CE...
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http://en.wikipedia.org/wiki/SpaceTime_(software)

In physics, spacetime (also space–time, space time or space–time continuum) is any mathematical model that combines space and time into a single interwoven continuum. The spacetime of our universe is usually interpreted from a Euclidean space perspective, which regards space as consisting of three dimensions, and time as consisting of one dime...
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http://en.wikipedia.org/wiki/Spacetime

The union of space and time into a four-dimensional whole. More precisely, the inseparable four-dimensional manifold, or combination, which space and time are considered to form in the special and general theories of relativity. In the absence of a gravitational field, spacetime reduces to Minkowski...
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http://www.daviddarling.info/encyclopedia/S/spacetime.html

Space has three dimensions. However, the theory of relativity predicts that time, like space, is a dimension. In order to describe a four dimensional universe which has three spatial dimensions and one time dimension the word 'spacetime' was coined. Each point in spacetime is called an event.
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http://www.encyclo.co.uk/local/20103

A combination of time and three-dimensional space that forms a four-dimensional geometry expressing the connections between space and time. See also: Time.
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https://www.encyclo.co.uk/local/20687
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