incident

nouns

a single distinct event
is a part of
a happening that is distinctive in a series of related events
is a type of (narrower)
an event that happens
a public disturbance
"the police investigated an incident at the bus station"
is a type of (narrower)
a disorderly outburst or tumult
"they were amazed by the furious disturbance they had caused"

adjectives

falling or striking of light rays on something
"incident light"
is derived from
pertains to
(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"