INSTALLATION  , the

action of installing or formally placing some one in occupation of an office or place . The med . Lat. installare meant literally " to place in a seat or stall " (stallum), and the word, as now, was particularly used of the ceremonial induction of an ecclesiastic, such as a canon or prebendary, to his stall in his cathedral choir . Similarly knights of an order of chivalry are ceremonially led to their stalls in the chapel of their order . The term is transferred to any formal establishment in office or position . From a French use of installer and installation, the word is frequently applied in a transferred sense to the fixing in position and making ready for use of a mechanical, particularly electrical, apparatus or plant .