Installation

Noun

1. An act of installing.

   "The installation of the new software took only a few minutes."

2. Something installed, especially the whole of a system of machines, apparatus, and accessories, when set up and arranged for practical working, as in electric lighting, transmission of power, etc.
3. A work of installation art.

   "The museum is displaying a modern art installation."

4. A grouping of facilities that constitute a permanent military base.

   "A military installation was built near the border."