v.tr. (also instal) (installed, installing) 1 place (equipment, machinery, etc.) in position ready for use. 2 place (a person) in an office or rank with ceremony (installed in the office of chancellor). 3 establish (oneself, a person, etc.) in a place, condition, etc. (installed herself at the head of the table). installant adj. & n. installer n.
[ med.L installare (as IN-(2), stallare f. stallum STALL(1)) ]