install (v.)youdaoicibaDictYouDict
early 15c., "place in (ecclesiastical) office by seating in an official stall," from Medieval Latin installare, from Latin in- "in" (see in- (2)) + Medieval Latin stallum "stall," from a Germanic source (compare Old High German stal "standing place;" see stall (n.1)). Related: Installed; installing.
installation (n.)youdaoicibaDictYouDict
"action of installing," mid-15c., of church offices or other positions, from Medieval Latin installationem (nominative installatio), noun of action from past participle stem of installare (see install). Of machinery, etc., "act of setting up," from 1882.
installment (n.)youdaoicibaDictYouDict
"act of installing," 1580s, from install + -ment. Meaning "arrangement of payment by fixed portions at fixed times" is from 1732, alteration of Anglo-French estaler "fix payments," from Old French estal "fixed position, place," from a Germanic source akin to Old High German stal "standing place" (see stall (n.1)). Figurative sense of "part of a whole produced in advance of the rest" is from 1823.
reinstall (v.)youdaoicibaDictYouDict
also re-install, 1590s, from re- + install. Related: Re-installed; re-installing.