instalmentyoudaoicibaDictYouDict
"A sum of money due as one of several equal payments for something, spread over an agreed period of time", Mid 18th century (denoting the arrangement of payment by instalments): alteration of obsolete estalment (probably by association with installation), from Anglo-Norman French estalement, from Old French estaler 'to fix'.
poste restanteyoudaoicibaDictYouDict
"A service offered by a post office whereby mail is kept for an agreed period until collected by the addressee", Mid 18th century: from French, literally 'mail remaining'.