integral calculusBrE /ˌɪntɪɡrəl ˈkælkjələs/ 🔊NAmE /ˌɪntɪɡrəl ˈkælkjələs/ 🔊 noun [uncountable] (mathematics 数学) a type of mathematics that deals with quantities that change in time. It is used to calculate a quantity between two particular moments. 积分学 ➡ compare differential calculus