級きゅう数すうきゅうすうFreq.FrequencyTop 100,000Meanings1nounseriesmathematicsMathematical term for the sum of a sequence. Used in contexts like arithmetic series, geometric series, and power series.この級きゅう数すうは収しゅう束そくする。This series converges.等とう比ひ級きゅう数すうの和わを求もとめる。Find the sum of the geometric series.