汉：来源于拉丁语及法语的名词后缀-ence(-ency)的用法与-ance(-ancy)基本相同。它们加在动词或动词词根后，意为the act or fact of ～ing或者the quality or condition of ～ing,即表示行为或该行为的性质状态等。这些名词往往有与之对应的以-ent结尾的形容词。

-ence,-ency与形容词后缀-ent相对应（如 difference-different；urgency-urgent），表示性质、状态、行为，后缀-ence和-ency义同，有些英语单词具有-ence和-ency两种形式（如 innocence = innocency ; persistency = persistence）。

英：
-ence:see -ance.
-ency:word-forming element denoting quality or state, from Latin -entia. Derivatively identical with -ence. -ence
a noun suffix equivalent to -ance, corresponding to the suffix -ent in adjectives: abstinence; continence; dependence; difference .
Origin:
Middle English < Old French < Latin -entia, equivalent to -ent- -ent + -ia -y World English Dictionary
-ence or -ency
— suffix forming nouns
indicating an action, state, condition, or quality: benevolence ; residence ; patience
[via Old French from Latin -entia, from -ēns, present participial ending]

-ency or -ency
— suffix forming nouns
[via Old French from Latin -entia, from -ēns, present participial ending] --------------------------------------------------------------------------------
-ency
a noun suffix, equivalent to -ence:, consistency; dependency; exigency.
Origin:
-ence + -y World English Dictionary
-ence or -ency
— suffix forming nouns
indicating an action, state, condition, or quality: benevolence ; residence ; patience
[via Old French from Latin -entia, from -ēns, present participial ending] -ency or -ency
— suffix forming nouns
[via Old French from Latin -entia, from -ēns, present participial ending]
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1.competence
n.being competent;ability 胜任，能力 *com(=together),pet(=seek)
例句：Are you questioning my competence?你是在质疑我的能力吗？

2.complacency
n.self-satisfaction 自我满足 *com(=completely),place(=peace)
例句：In professional sports,there is no place for complacency.在职业运动中，不可以有丝毫的自满。

3.conference
n.(meeting for) discussion;exchange of views 协商，讨论（会）；会议 *con 例句：The tripartite conference will be held in Honolulu.三方会议将在火奴鲁鲁召开。

4.obedience
n.the condition of doing what one is told to do 服从，顺从 *ob(=intensive),ed 例句：My wife has been taking Tito,our dog,to obedience classes.我妻子一直带我们家的狗提托支参加守纪训练班。

5.opulence
n. wealth; abundance 富裕，丰饶；丰富 *opul(=wealth,riches)
例句：The apparent opulence of Malaysia surprised the tour group.马来西亚明显的富饶令旅游团的成员感到惊讶。