incident

a single distinct event

a public disturbance; "the police investigated an incident at the bus station"

falling or striking of light rays on something; "incident light"

(sometimes followed by `to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence; "incidental expenses"; "the road will bring other incidental advantages"; "extra duties incidental to the job"; "labor problems incidental to a rapid expansion"; "confusion incidental to a quick change"