Word: 指数 (zhǐshù) Traditional: 指數 指数 dictionary entry zhǐshù index; exponent; exponential Full dictionary entry for 指数 Example sentences using 指数 2 sentences, showing page 1 of 1. 在二的三次方里，三是指数。 Zài èr de sāncìfāng lǐ, sān shì zhǐshù. In two to the power of three, three is the exponent. 病毒的传播速度呈指数增长。 Bìngdú de chuánbō sùdù chéng zhǐshù zēngzhǎng. The virus spread at an exponential rate.