An event or occurrence.

“It was an incident that he hoped to forget.”

A (relatively minor) event that is incidental to, or related to others.

An event that causes or may cause an interruption or a crisis, such as a workplace illness or a software error.

Arising as the result of an event, inherent.

(of a stream of particles or radiation) Falling on or striking a surface.

“The incident light illuminated the surface.”

Coming or happening accidentally; not in the usual course of things; not in connection with the main design; not according to expectation; casual; fortuitous.