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adjective
(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"
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noun
a public disturbance
"the police investigated an incident at the bus station"
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noun
a single distinct event
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falling or striking of light rays on something
"incident light"