to place (something) in position for use or service
They had a shower installed in the bathroom
to establish (somebody) in a specified place, condition, or status
to induct (somebody) into an office, rank, or order, esp with ceremonies or formalities
Once a new chairman had been installed, the company's fortunes began to improve
installer noun
[early French installer from medieval Latin installare to put in a stall, from in-2 + stallum place, stall]