subsum

Noun

 * 1)  The sum of a subset of values.

Etymology
From.

Verb

 * 1)  to be under, among or behind
 * 2)  to be at the bottom
 * 3)  to be nearby
 * 1)  to be nearby
 * 1)  to be nearby

Usage notes

 * The perfect and future participle forms are non-Classical.