noun / verb
remainder
ri-MAYN-der/rɪˈmeɪndər/
What is left after the rest is removed or accounted for.
The cake's remainder is a single quarter on the serving plate.

Etymology
Like remain, remainder rests on the idea of “staying behind.” A verb meaning “to remain” was used as a noun, eventually naming whatever is left after separation or removal.
In context
… should with cheerfulness have passed the remainder of my life in their dear Society
More examples
- Dividing seventeen by five leaves a remainder of two.
- I found the novel among the bookstore's discounted remainders.
- The publisher remainders unsold copies at a steep discount.
Forms
remainder · remainders · remaindered · remaindering
remain verb — To stay or be left behind.