one of the equal parts (i.e. sums of money) into a which a debt is divided, due to be paid at regular intervals over an agreed period of time as part of the repayment process;
e.g. After he pays this month's installment, he will have paid off the entire loan.
(noun)
one of the parts into which a work (like a book/story or film) is divided, after which it is released in sequence by publication or broadcast;
e.g. Nick is writing the final installment of his book series called 'The Pepperwood Chronicles'.
(noun)
installation, or the act of installing something;
e.g. The installment process should take a few hours.