Definition of Incidence

1. Noun. The relative frequency of occurrence of something.

Exact synonyms: Relative Incidence
Generic synonyms: Frequency, Relative Frequency
Specialized synonyms: Morbidity

2. Noun. The striking of a light beam on a surface. "He measured the angle of incidence of the reflected light"
Generic synonyms: Optical Phenomenon
Derivative terms: Incident

Definition of Incidence

1. n. A falling on or upon; an incident; an event.

Definition of Incidence

1. Noun. The act of something happening; occurrence ¹

2. Noun. The extent, or the relative frequency of something happening ¹

3. Noun. (physics) The striking of radiation or a projectile upon a surface ¹

4. Noun. (epidemiology) A measure of the risk that a person develops a new condition within a specified period of time, usually a year. ¹

¹ Source:

Definition of Incidence

1. [n -S]

Medical Definition of Incidence

1. 1. An act or the fact or manner of falling upon or affecting. 2. Rate, range or amount of occurrence or influence. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

Incidence Pictures

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Lexicographical Neighbors of Incidence

inchoative aspect
incidence (current term)
incidence angle
incidence density
incidence function
incidence functions
incidence matrix
incidence rate
incident angle
incident light
incident pain
incident point

Literary usage of Incidence

Below you will find example usage of this term as found in modern and/or classical literature:

1. Nature by Norman Lockyer (1878)
"The point marked o, where the light strikes the mirror, is called the point of incidence. you will see a single spot of light, the reflection from the ..."

2. Mathematical and Physical Papers by Sir George Gabriel Stokes, Baron John William Strutt Rayleigh (1901)
"As the angle of incidence increases the bands become finer and finer, and after they have become too fine to be distinguished by the naked eye they may ..."

3. The Medical Implications of Nuclear War by Fredric Solomon (1986)
"National Academy Press, Washington, DC Expected incidence of Cancer ... The calculation of expected incidence of cancer following nuclear war can be based ..."

4. The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, and General by Thomas Spencer Baynes (1890)
"As the angle of incidence passes through the polarizing angle, the reflected vibration changes sign, and increases in numerical value until it atteins unity ..."

5. The English Works of Thomas Hobbes of Malmesbury by Thomas Hobbes (1839)
"OF ANGLES OF incidence AN» REFLECTION, EQUAL BY SUPPOSITION. I made by two strait lines drawn from the centre to the points of incidence.—4. ..."

6. A Lifelong Passion: Nicholas and Alexandra: Their Own Story by Andrei Maylunas (2005)
"There was no difference in the incidence of these factors in the two sub-groups. ... As a result of this study, prospective studies of the incidence of ..."

7. Physical Optics by Robert Williams Wood (1911)
"The formula for the reflected amplitude, parallel to the plane of incidence, shows us that the phase changes suddenly by 180° on passage through the angle ..."

8. Scientific Papers by John William Strutt Rayleigh (1902)
"For a general solution of the problem of reflexion from a twin plane, we should have to suppose the plane of incidence to be inclined at an arbitrary angle ..."

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