noun Download 🔗Share A function that is a many-to-one mapping; (formally) Any function f: X\rightarrow Y for which for every y \in Y, there is at least one x \in X such that f(x) = y. Examples : "In the classroom, the function mapping each student's name to their assigned seat is a surjection because every seat is occupied by at least one student. " math function Chat with AIVocabulary GamePractice Reading