| incidence | 1. An act or the fact or manner of falling upon or affecting. 2. <statistics> Rate, range or amount of occurrence or influence. (18 Nov 1997) |
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| incidence density | The person-time incidence rate. (05 Mar 2000) |
| incidence rate | The rate at which new events occur in a population. The numerator is the number of new events occurring in a defined period; the denominator is the population at risk of experiencing the event during this period. (05 Mar 2000) |
| angle of incidence | <optics> The angle that a ray entering a refracting medium makes with a line drawn perpendicular to the surface of this medium, the angle that a ray striking a reflecting surface makes with a line perpendicular to this surface. Synonym: incident angle. (05 Mar 2000) |
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| plane of incidence | The plane perpendicular to a lens surface that contains the incident light ray. (05 Mar 2000) |