Question

10. cad, cas, cid [L]=

Accepted Answer

to fall, to befall 降，降临
cad，cas，cid 是同源异形词根，都源于拉丁动词cadere，意思相当于to fall（降落）或to befall
（降临）。其中，cad 是不定式词干，cas 是动名词词干，而cid 是cadere 的异体cidere 的不
定式词干。这族同根词的数量较大。

decadent [de-=down 下；cad=to fall 降；-ent a.=-ing 表性质→“falling down 下降的”] a. falling
down morally;falling into ruin 堕落的；颓败的：The Ching Empire had become decadent by that
time.当时清帝国已经腐败了。

▽decadence [de-;cad;-ence n.] n.衰落；颓废

case [cas=to befall 降临；-e→“that which befalls 降临之事”→] n. event;condition 事件；情
况：a typical case 典型事件

casual [cas=to befall 降临；-u-;-al a.=having the quality 有……性质的→“having the quality of
befalling, or happening by chance 带有偶发性质的”→] a.① not planned 偶然的：a casual
meeting 巧遇② infor-mal 非正式的：casual clothing 便服

▽casualty [casual;-ty n.] n.事故的伤亡者

occasion [oc-（ob-）=in the way of 在……面前；cas=to befall 降临；-ion n.=the state or result
表状态或结果→“that which befalls in one's way 降临在面前的事”→] n.① instance or case
情况② favorable time, or opportunity 时机；机会：as occasion serves 一旦有适当的机会

▽occasional [occasion;-al a.] a.偶尔的

accident [ac-(ad-)=towards 朝向；cid=to befall 降临；-ent n.=thing 事→“thing that befalls towards
a person 朝着某人降临的事”→] n. ①unexpected event 意外的事；偶然的事：I met her quite
by accident.我碰到她是很偶然的事。② unfortunate happening 事故：traffic acci-dents 交通事
故

▽accidental [accident;-al a.] a.意外的；偶然的

incident [in-=on, upon 在……上；cid=to befall 发生；-ent n.=thing 事→“thing that befalls on a
particular person or happens at a particular time 发生在某人身上或某个时刻的事”→] n. event,
or occurence 事件；事变：the July 7th Incident 七七事变

▽incidental [incident;-al a.] a.偶然的；伴随的
incidence [in-;cid;-ence n.] n.发生；发生率

coincide [co-（com-）=together 共同；in-=upon 在……之上；cid=to befall 降临→“to befall upon
together 共同降临在……之上”] v. ①happen at the same time or same place（时间、空间）
恰好相合：My birthday coincides with yours. 我恰好和你同一天生日。② agree;correspond
一致；符合：to coincide in opinion 意见相符

▽coincident [coincid(e);-ent a.] a.同时发生的；一致的

deciduous [de-=off 脱离；cid=to fall 降；-u-;-ous a.=having the quality 有……性质的→] a. having
the quality of falling off at a certain time 定期脱落的：deciduous trees 落叶林

occident [oc-（ob-）=down 下；cid=to fall 降落；-ent n.=thing connected with 表相关事物→
“the direction towards which the heavenly bodies were supposed to fall down 前人认为的天体
降落的方向”→] n.① the west 西方② the western hemisphere 西半球：the Occident 亚洲以
西的全部国家；欧洲；欧美

▽occidental [occident;-al a.] a.西方的

decay [de-=down 下；cay（cad 的变形）=to fall 降→] v. fall down from a state of health and
excellence;rot 衰退；腐朽：The old man's teeth are all decayed.这老人的牙齿全坏了。

Befall Fall Quality N Case N.=Thing Time Decadent