installment

noun

• 1a sum of money due as one of several equal payments for something, spread over an agreed period of time:the first installment of a grant for housing the purchase price is paid in installments

• 2any of several parts of something that are published, broadcast, or made public in sequence at intervals:filming the final installment in his Vietnam trilogy

• 3the process of installing something; installation:installment will begin early next year