A 1732 alteration of estallment, from Anglo-Norman estaler, from Old French estal, from Old High German stal
: The sense of "part of a whole produced in advance of the rest" is from 1823.
From install + -ment, install from Old French installer, from Medieval Latin installare, from Medieval Latin in- and Medieval Latin stallum, stall from a Germanic source (compare Old High German stal)
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