intersect definition
Full Definition of INTERSECTION. 1. : the act or process of intersecting. 2. : a place or area where two or more things (as streets) intersect.3. a: the set of elements common to two or more sets; especially: the set of points common to two geometric configurations b: the operation of finding the intersection of two or more sets. See intersection defined for English-language learners.efinition of INTERSECTION for Kids. 1. 2. : the place or point where two or more things (as streets) meet or cross each other. 3. : the set of mathematical elements common to two or more sets.