0 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:
1 one of a number of payments that you make over a period of time to pay for something that you can use while you are paying for it:
We paid for the car in monthly installments over two years.
a TV miniseries with five installments
2 → instalment
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.