1. The act of installing or giving possession of an office, rank, or order, with the usual rites or ceremonies; as, the installation of an ordained minister in a parish. On the election, the bishop gives a mandate for his installation. (Ayliffe)
2. (Science: mechanics) 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.
Origin: f. Installation, LL. Installatio: cf. It. Installazione. See Install.