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incidence

[in-si-duh ns]
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noun
  1. the rate or range of occurrence or influence of something, especially of something unwanted: the high incidence of heart disease in men over 40.
  2. a falling upon, affecting, or befalling; occurrence: The incidence of murder that Sunday afternoon shocked the sleepy village.
  3. Optics, Physics.
    1. the striking of a ray of light, beam of electrons, etc., on a surface, or the direction of striking.
    2. angle of incidence(def 1).
  4. the fact or the manner of being incident.
  5. Geometry. partial coincidence of two figures, as of a line and a plane containing it.
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Origin of incidence

First recorded in 1375–1425; late Middle English word from Late Latin word incidentia. See incident, -ence
Can be confusedincidence incidents incidental
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for incidence

prevalence, proportion, rate, frequency, extent, percentage, degree, trend, drift, number, measure, scope, tendency, commonness

Examples from the Web for incidence

Contemporary Examples of incidence

Historical Examples of incidence


British Dictionary definitions for incidence

incidence

noun
  1. degree, extent, or frequency of occurrence; amounta high incidence of death from pneumonia
  2. the act or manner of impinging on or affecting by proximity or influence
  3. physics the arrival of a beam of light or particles at a surfaceSee also angle of incidence
  4. geometry the partial coincidence of two configurations, such as a point that lies on a circle
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for incidence

n.

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.

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Online Etymology Dictionary, © 2010 Douglas Harper

incidence in Medicine

incidence

(ĭnsĭ-dəns)
n.
  1. The extent or rate of occurrence, especially the number of new cases of a disease in a population over a period of time.
  2. The arrival of radiation or a projectile at a surface.
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Related formsinci•dent adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.