Webster's Revised Unabridged Dictionary (1913 + 1828)
Displaying 1 result(s) from the 1913 edition:
Incidence (Page: 743)
In"ci*dence (?), n.
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.