The act of something happening; occurrence.
The falling of a point on a line, or a line on a plane.
The striking of radiation or a projectile upon a surface.
The manner of falling; bearing or onus, as of a tax that falls unequally.
The extent or the relative frequency of something happening.
A measure of the rate of new occurrence of a given medical condition in a population within a specified period of time.
An event, or sequence of events, that leads up to something.