Alternative forms 
From Middle English installen, from Medieval Latin installō (“to install, put in place, establish”), from in- + stallum (“stall”), from Frankish *stall (“stall, position, place”), from Proto-Germanic *stallaz (“place, position”), from Proto-Indo-European *stelǝ-, *stAlǝn-, *stAlǝm- (“stem, trunk”). Cognate with Old High German stal (“location, stall”), Old English steall (“position, stall”), Old English onstellan (“to institute, create, originate, establish, give the example of”), Middle High German anstalt (“institute”), German anstellen (“to conduct, employ”), German einstellen (“to set, adjust, position”), Dutch aanstellen (“to appoint, commission, institute”), Dutch instellen (“to set up, establish”). More at in, stall.
- (transitive) To connect, set up or prepare something for use
- I haven't installed the new operating system yet because of all the bugs.
- (transitive) To admit formally into an office, rank or position.
- He was installed as Chancellor of the University.
- (transitive) To establish or settle in.
- I installed myself in my usual chair by the fire.
Related terms 
install (plural installs)
- (informal) Installation. (Usage originated as a truncated form of the word installation.)
- (computing) (jargon): A computer software utility that is run to install a software application. Also used attributively.
- After inserting the disk, you need to run the install.
- But I can't find the install disk.