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[in-si-duh ns] /ˈɪn sɪ dəns/

the rate or range of occurrence or influence of something, especially of something unwanted:
the high incidence of heart disease in men over 40.
a falling upon, affecting, or befalling; occurrence:
The incidence of murder that Sunday afternoon shocked the sleepy village.
Optics, Physics.

the fact or the manner of being incident.
Geometry. partial coincidence of two figures, as of a line and a plane containing it.
degree, extent, or frequency of occurrence; amount: a high incidence of death from pneumonia
the act or manner of impinging on or affecting by proximity or influence
(physics) the arrival of a beam of light or particles at a surface See also angle of incidence
(geometry) the partial coincidence of two configurations, such as a point that lies on a circle

early 15c., “incidental matter,” from Middle French incidence (15c.), from Late Latin incidentia (see incident (n.)). Meaning “act of coming into contact with” is from 1650s; sense in physics is from 1620s.

incidence in·ci·dence (ĭn’sĭ-dəns)

in’ci·dent adj.


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