A definite and separate occurrence; an event. See Synonyms at occurrence. A usually minor event or condition that is subordinate to another. Something contingent on or related to something else. An occurrence or event that interrupts normal procedure or precipitates a crisis: an international incident. Tending to arise or occur as a result or accompaniment: "There is a professional melancholy . . . incident to the occupation of a tailor\u201d ( Charles Lamb). Related to or dependent on another thing. Physics Falling upon or striking a surface: incident radiation.