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Installation (as used herein)

Definitions:

  Any of the following actions: - Executing an installer to load software. - Listing Software in the operating system software directory. - (Merely) placing executable software on a medium from which it can be executed, even if no installer software is run and there is no listing for it in the operating system software directory. - Any other action that allows an executable software file to be loaded into the CPU (e.g., browsing a website that downloads software; opening an e-mail (or attachment) that downloads software; etc.).
Sources:
NISTIR 8011 Vol. 3