Definify.com
Webster 1913 Edition
Incidence
In′ci-dence
,Noun.
[Cf. F.
incidence
.] 1.
A falling on or upon; an incident; an event; an occurrence.
[Obs.]
Bp. Hall.
2.
(Physics)
The direction in which a body, or a ray of light or heat, falls on any surface.
In equal
incidences
there is a considerable inequality of refractions. Sir I. Newton.
Angle of incidence
, the angle which a ray of light, or the line of incidence of a body, falling on any surface, makes with a perpendicular to that surface; also formerly, the complement of this angle.
– Line of incidence
, the line in the direction of which a surface is struck by a body, ray of light, and the like.
Webster 1828 Edition
Incidence
IN'CIDENCE
,Noun.
1.
Literally, a falling on; whence, an accident or casualty.2.
The manner of falling on, or the direction in which one body falls on or strikes another. The angle which the line of falling, or the direction of a moving body striking another, makes with the place struck, is called the angle of incidence. When rays of light striking a body are reflected,the angle of incidence and the angle of reflection are equal. In equal incidences there is a considerable inequality of refractions.
Definition 2024
incidence
incidence
English
Homophones
Noun
incidence (plural incidences)
- The act of something happening; occurrence
- The extent, or the relative frequency of something happening
- (physics) The striking of radiation or a projectile upon a surface
- (epidemiology) A measure of the risk that a person develops a new condition within a specified period of time, usually a year.
Usage notes
- Compare with incident.
Translations
The extent, or the relative frequency of something happening
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Derived terms
Derived terms
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