in ‧ stal ‧ la ‧ tion /ˌɪnstəˈleɪʃ ə n/ BrE AmE noun
1 . [uncountable] when someone fits a piece of equipment somewhere:
the installation and maintenance of alarm systems
2 . [countable] a piece of equipment that has been fitted in its place:
The whole computer installation was nearly new.
3 . [countable] a place where industrial or military equipment, machinery etc has been put:
nuclear installations
4 . [countable] a piece of modern art which can include objects, light, sound etc
5 . [uncountable] formal the ceremony of putting someone in an important job or position:
the installation of the new bishop