quadrillion /kwo'dnlisn; kwad'nljsn/ n 1 (GB) fourth power of one million (1 followed by 24 ciphers). (英) 一百萬之四次方; 1 后加 24 個零之?dāng)?shù)。 2 (US) fifth power of one thousand (1 followed by 15 ciphers). (美) 一千之五次方; 1 后加 15 個零之?dāng)?shù)。 0 App 4. 參看附錄四。