SISFreq.FrequencyTop 100,000Meanings1nounstrategic information system (SIS)businessBusiness term for an information system that supports strategic decision-making.See also: 戦略情報システム当とう社しゃは新あらたなSISを導入しすをどうにゅし、経営戦略うし、けいえいせんりゃの強化くのきょうかを図はかった。Our company introduced a new SIS to strengthen its management strategy.