Installment
Part of speech: noun
Definition: The act of installing; installation. The seat in which one is placed. 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 (often equal namely regular, e.g. mensual) being often definitely stipulated. a part of a broadcast or published serial. anything that is performed in parts, spread in time
Example sentence: I've worked with multiple directors throughout the 'Saw' series with a lot of conversations as they bring their particular installment to the screen. If I've been able to do anything throughout the course of these films, it's been to help shape dialogue and to try to make things as delicate and as intelligent as I can.
Instalment
Part of speech: noun
Definition: One of a series of parts, whether equal or unequal to the other parts of the series, of a given entity or a given process, which part presents or is presented at a particular scheduled interval.Standard spelling for all senses.