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/ˈɪnsədəns/ /ˈɪnsɪdəns/ Listen

noun

Incidence n.

A falling on or upon; an incident; an event; an occurrence. (Obs.)

(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."

The rate or ratio at which something occurs; as, the incidence of murder in Los Angeles; the incidence of cancer in men over 50.

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.

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Etymology of 'Incidence'

Collaborative International Dictionary of English 0.48

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"Incidence" Quotes from Famous Books

... due to any intensity of this strain that we find the incidence of insanity in men of genius, as illustrated, for example, by senile dementia, so much more marked than its incidence on their parents. There is another factor to be invoked here: convergent morbid heredity. If a man and a woman, each with a slight ...

— Essays in War-Time - Further Studies In The Task Of Social Hygiene • Havelock Ellis

... other hand he finds that he is not without responsibilities. The rate-collector knocks at the cottage door as well as at the farmer's. By gradual degrees village rates are becoming a serious burden, and though their chief incidence may be upon the landlord and the tenant, indirectly they begin to come home to the labourer. The school rate is voluntary, but it is none the less a rate; the cemetery, the ancient churchyard being no more available, ...

— Hodge and His Masters • Richard Jefferies

... may be exactly measured, thereby to give the Curious an opportunity of making Trials of that kind, to establish the Laws of Refraction, to wit, whether the Sines of the Angles of Refraction are respectively proportionable to the Sines of the Angles of Incidence: This Instrument being very proper to examine very accurately, and with little trouble, and in small quantities, the Refraction of any Liquor, not only for one inclination, but for all; whereby he is enabled to ...

— Philosophical Transactions of the Royal Society - Vol 1 - 1666 • Various

... a wide arc of a circle whose lower extremity is connected with the corridor of the larva and whose upper extremity is prolonged in a straight line which ends at the surface with a perpendicular or slightly oblique incidence. The wide connecting arc enables the insect to tack about. When, starting from a position parallel with the axis of the tree, the Sirex has passed gradually to a transversal position, he completes his course in a straight line, ...

— The Glow-Worm and Other Beetles • Jean Henri Fabre

... theme I must not linger now. Not only because "the time would fail me," but because we have to remember that the main incidence of the Apostle's thought here is not upon the blessedness of death but upon the joy of duty, the "fruit of labour," in continued life. He looks in through the gate, not to sigh because he may not enter yet, but "to run with all his might," in the path of unselfish ...

— Philippian Studies - Lessons in Faith and Love from St. Paul's Epistle to the Philippians • Handley C. G. Moule

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