in‧stal‧ment (also installment American English) /ɪnˈstɔːlmənt $ ɪnˈstɒːl-/ noun [countable]

1. one of a series of regular payments that you make until you have paid all the money you owe:
the second instalment of a loan
They’re letting me pay for the washing machine by monthly instalments.

2. one of the parts of a story that appears as a series of parts, especially in a magazine, newspaper etc:
the first instalment of a science fiction trilogy

[TahlilGaran] Dictionary of Contemporary English ▲