1 [uncountable]T when someone fits a piece of equipment somewhere:
the installation and maintenance of alarm systems
2 [countable]T a piece of equipment that has been fitted in its place:
The whole computer installation was nearly new.
3 [countable]TIPM 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] formalBO the ceremony of putting someone in an important job or position:
the installation of the new bishop

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