1 [noncount] : the act or process of making a machine, a service, etc., ready to be used in a certain place : the act of installing something
▪ The cable company offers lower prices and free installation. ▪ These products are designed for easy installation. 2 [singular] : a ceremony in which someone is put in an official or important job
▪ Her installation as president will take place tomorrow. 3 [count] : something (such as a piece of equipment) that is put together and made ready for use
▪ The room contained the company's large computer installation. 4 [count] : a place that is used for training soldiers, keeping military supplies and machinery, etc.
▪ bases, forts, training camps, and other army installations 5 [count] : a work of art that usually has several parts (such as a sculpture, lights, and sound) and that is usually shown in a large space