Installment

[Tina]

A portion of a debt, or sum of money, which is divided
into portions that are made payable at different times. Payment by
installment is payment by parts at different times, the amounts and
times being often definitely stipulated.

[Cami]

part of a [series] (of payments, [books], [articles] etc.)

[Justin Bieber]

A sum of money due as one of several equal payments for something, spread over an agreed period of time.

[Becky]

one of several parts into which a story, plan, or amount of money owed has been divided, so that each part happens or is paid at different times until the end or total is reached: