An instalment of a story or plan is one of its parts that are published or carried out separately one after the other. the disappointing third instalment of the Highlander series. = part
{i} one of several separate payments into which a debt has been divided; one of a number of parts which are given out at different times, section, portion; act of installing, putting in place (also installment)
the act of installing something (as equipment); "the telephone installation took only a few minutes"
in·stal·ment instalments in AM, use installment1. If you pay for something in instalments, you pay small sums of money at regular intervals over a period of time, rather than paying the whole amount at once. The first instalment of £1 per share is payable on application