/in'steuh lay"sheuhn/ , n.
1. something installed, as machinery or apparatus placed in position or connected for use.
2. the act of installing.
3. the fact of being installed.
4. Mil. any more or less permanent post, camp, station, base, or the like, for the support or carrying on of military activities.
[ 1600-10; installation- (s. of installatio ). See INSTALL, -ATION ]