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incidence

[in-si-duh ns] /ˈɪn sɪ dəns/
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.
Origin of incidence
late Middle English
1375-1425
1375-1425; late Middle English < Late Latin incidentia. See incident, -ence
Can be confused
incidence, incidents, incidental.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for incidence

incidence

/ˈɪnsɪdəns/
noun
1.
degree, extent, or frequency of occurrence; amount: a 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 surface See also angle of incidence
4.
(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
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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.

Online Etymology Dictionary, © 2010 Douglas Harper
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incidence in Medicine

incidence in·ci·dence (ĭn'sĭ-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.


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