[ 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.
  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).
the fact or the manner of being incident.
Geometry. partial coincidence of two figures, as of a line and a plane containing it.

Origin of incidence

First recorded in 1375–1425; late Middle English word from Late Latin word incidentia. See incident, -ence


incidence incidents incidental Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for incidences

British Dictionary definitions for incidences

/ (ˈɪnsɪdəns) /


degree, extent, or frequency of occurrence; amounta 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 surfaceSee also angle of incidence
geometry the partial coincidence of two configurations, such as a point that lies on a circle
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

Medical definitions for incidences

[ ĭnsĭ-dəns ]


The extent or rate of occurrence, especially the number of new cases of a disease in a population over a period of time.
The arrival of radiation or a projectile at a surface.

Other words from incidence

inci•dent adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.