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virtual machine

noun, Computers.
1.
Also called system virtual machine. a self-contained operating environment that behaves as if it is a separate computer, with no access to the host operating system:
When an application runs in a virtual machine, there is little chance that it will damage files or applications in the host system.
2.
Also called process virtual machine, application virtual machine. a platform-independent execution environment that itself runs as a normal application inside a host operating system and enables a program written for the virtual machine to execute the same way on any platform:
JVM, written in the Java programming language, is the most common process virtual machine.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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