Math
- Incidence algebra, associative algebra used in combinatorics, a branch of mathematics
- Incidence geometry, the study of relations of incidence between various geometrical objects
- Incidence (geometry), the binary relations describing how subsets meet
- Incidence list, a concept in graph theory
- Incidence matrix, a matrix that shows the relationship between two classes of objects
- Incidence structure, a feature of combinatorial mathematics
- Cumulative incidence, a measure of frequency
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