Definition of "incidence" in English

noun

1. The act of something happening; occurrence.

2. The extent or the relative frequency of something happening.

3. The manner of falling; bearing or onus, as of a tax that falls unequally.

4. (physics) The striking of radiation or a projectile upon a surface.

5. (epidemiology) A measure of the rate of new occurrence of a given medical condition in a population within a specified period of time.

6. (geometry) The falling of a point on a line, or a line on a plane.

7. (graph theory) The relation between an edge of a graph and one of the vertices it connects.