partial product
noun
1- Mathematics the product of one term of a multiplicand and one term of its multiplier【数】部分（乘）积。
1.1
- the product of the first n terms of a large or infinite series, where n is a finite integer (including 1)部分积（一个很大的或无穷序列的前n个项的积, 在这里n是一个有限的整数, 包括1）。