installationin·stal·la·tion /ˌɪnstəˈleɪʃən/ noun1[countableC] a building containing industrial or military equipment and machineslarge industrial installations
They targeted their attacks on government installations.
2[uncountableU] when a new piece of equipment is installed somewhereThey had allowed $2.7 million for installation of a new computer system.
3[uncountableU] when a new program is put into a computerthe installation of new anti-virus software