a. [f. SUM v.1 + -ABLE.] Capable of being summed.
1784. Phil. Trans., LXXIV. 395. Mr. James Bernouilli found summable serieses by assuming a series V.
1841. J. R. Young, Math. Dissert., iii. 125. None of the series belonging to the class referred to … are summable in finite numbers.
