The relative frequency of occurrence of something.

synonym: relative incidence.

Roget 278: direction, bearing, course, vector; set, drift, tenor; tendency etc. 176; incidence; bending, trending etc. v.; dip, tack, aim, collimation; steering steerage.    point of the compass, cardinal points; North East, South, West; N by E, ENE, NE by N, NE, &c.; rhumb^†, azimuth, line of collimation.    line, path, road, range, quarter, line of march; alignment, allignment^†; air line, beeline; straight shoot.    ... show more

The striking of a light beam on a surface.