secession
词根词缀：
secede v. 正式退出（组织）
se 分开，离开 + ced 走 + e → 走开 → 正式退出
secern v. 区别；分开
se 分开，离开 + cern 搞清，区别 → 区别；分开
secession n. 退出；脱离
secede的名词
seclude v. 隔离；隐居
se 分开，离开 + clud 关闭 + e → 离开并关闭起来 → 隔离
seclusion n. 隔离；归隐
seclude的名词
secrete v. 藏匿
se 分开，离开 + cret 产生 + e →〔悄悄离开〕使产生分离 → 藏匿
seduce v. 勾引，诱惑
se 分开，离开 + duc 引导 + e → 引开 → 勾引〔别人〕
segregate v. 隔离
se 分开，离开 + greg 群体 + ate 使… → 使和人群分开 → 隔离
select v. 选择
se 分开，离开 + lect 选择 → 选择
数据来源：新东方英语词汇速记大全
相关例句：
Their friendship was very helpful in brokering peace on Ansion, and dousing the threat of secession.
他们的友谊，对安森星上的和平谈判和粉碎脱离共和国的威胁，非常有益。
The Sudanese referendum is likely to lead to secession by South Sudan.
苏丹全民公投很有可能导致南苏丹独立。
The secession of some southern state from the u.s.a. In the 1860s lead to a civil war
十九世纪六十年代美国南部一些州退出联邦导致了一场内战
Vienna Secession is a symbolism junta of Vienna in the19th century.
维也纳“分离画派”是十九世纪奥地利的象征主义派别。
Officials emphasized they were not establishing a separate government or seeking secession from Libya.
叛军官员强调，他们并没有另行成立一个政府，也没有寻求与利比亚分裂。
So obvious are the reasons which forbid this secession that it is necessary only to allude to them.
禁止退出的理由太过于明显，因此只要略予提及即可。