We don't have synonyms for instalmen yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are installed, instalment and installer.
"Take oaths from all kings and magistrates at their installment, to do impartial justice by law. Milton."
°(obsolete) The seat in which one is placed.
"The several chairs of order, look, you scour; . . . Each fair installment, coat, and several crest With loyal blazon, evermore be blest. Shakespeare."
"Take oaths from all kings and magistrates at their installment, to do impartial justice by law. Milton."
°(obsolete) The seat in which one is placed.
"The several chairs of order, look, you scour; . . . Each fair installment, coat, and several crest With loyal blazon, evermore be blest. Shakespeare."