a noticeable decline in performance; as, a falloff in automobile sales.

a noticeable deterioration in performance or quality; "the team went into a slump"; "a gradual slack in output"; "a drop-off in attendance"; "a falloff in quality"

Light attenuation between a spotlight's inner and outer cones.

The reduction in size or intensity of a sound wave due to increasing distance of a sound source from a ear.

Decrease in the intensity of light as it spreads out from the source.