Pronunciation: (sum'u-bul), [key]
1. capable of being added.
2. (of an infinite series, esp. a divergent one) capable of having a sum assigned to it by a method other than the usual one of taking the limit of successive partial sums.
3. (of a function) possessing a finite Lebesgue integral.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.