cross sec·tion, cross-section/ˈ· ˌ··/ n [C] 1 something that has been cut in half so that you can look at the inside, or a drawing of this 横截面（图）; 横剖面（图）: a cross section of the brain 大脑的横截面 2 a group of people or things that is typical of a larger group 典型; 具代表性的人［物］: a cross-section of the American public 美国公众中有代表性的一群人