incident

1、incident 和 accident 同一个"落"（-cid 义为「掉落」，同 accident、occasion）：事情落到你身上 = 发生的事。分别记：accident 是砸下来的意外，incident 是附带发生的一件，语气更正式、更中性。
2、英语就爱用"落"讲"发生"（英语就爱这么用，如 befall 和 chance）：befall 降临、chance 落到头上的机会、coincide 一起落到同一点 = 巧合。
3、别丢形容词义：incident light 入射光(落到面上那一束)、incidental 附带的、偶然的。拼写 in-ci-dent，中间的 -ci- 读 /sɪ/，别念成 "因西登特"。

incident 偶发事件，摩擦，冲突

in-,进入，使，-cid,掉落，落下，词源同accident,occasion.引申词义偶发事件，摩擦，冲突等。

incident

incident: [15] An incident is literally that which ‘befalls’. In common with accident and occident, and a wide range of other English words, from cadaver to occasion, it comes ultimately from Latin cadere ‘fall’. This was combined with the prefix in- ‘on’ to produce incidere ‘fall on’, hence ‘befall, happen to’. Its present participial stem incident- passed into English either directly or via French.

The use of a word that literally means ‘fall’ to denote the concept of ‘happening’ is quite a common phenomenon. It occurs also in befall and chance, and operates in other languages than English; Welsh digwydd ‘happen’, for instance, is derived from cwyddo ‘fall’.
=> accident, cadence, case, occasion

incident (n.)

early 15c., "something which occurs casually in connection with something else," from Middle French incident and directly from Latin incidentem (nominative incidens), present participle of incidere "happen, befall," from in- "on" + -cidere, comb. form of cadere "to fall" (see case (n.1)). Sense of "an occurrence viewed as a separate circumstance" is from mid-15c. Meaning "event that might trigger a crisis or political unrest" first attested 1913.

incident (adj.)

"conducive (to), contributing (to)," early 15c., from Middle French incident (adj.) or directly from Latin incidens, present participle of incidere (see incident (n.)).

1. A member of the security forces was killed in a sniping incident.

有一名安全部队成员在一场狙击战中被打死。

2. The violation of the graves is not the first such incident.

像这种破坏墓地的行为不是第一次出现了。

3. His abhorrence of racism led him to write The Algiers Motel Incident.

对种族主义的憎恨促使他写了《阿尔及尔汽车旅馆事件》一书。

4. The idea that she witnessed this shameful incident meant nothing to him.

虽然她目睹了这可耻的一幕，但是这对他来说无关紧要。

5. The incident brings the total of people killed to fifteen.

这次事故使死亡总人数达到15人。

【inference, issue, impact, incident】
inference: 推断，结论
issue: 问题，争议点
impact: 影响，冲击
incident: 事件

【accident, happening, event, occurrence, incident】
这组词都有“事故、事件”的意思，其区别是：
accident: 强调偶然或意外发生的不幸事情。
happening: 和occurrence这两个词多指日常生活中发生的一般事件，有时也指偶然发生的事。
event: 可指任何大小事件，但尤指历史上的重大事件。
occurrence: 和happening这两个词多指日常生活中发生的一般事件，有时也指偶然发生的事。
incident: 既可指小事件或附带事件，又可指政治上具有影响的事件或事变。