汉：抽象名词后缀acy意为"quality,state,act,position"。
英：
-acy
a suffix of nouns of quality, state, office, etc., many of which accompany adjectives in -acious or nouns or adjectives in -ate: fallacy; papacy; legacy; delicacy; piracy.
Origin:
< Latin -ācia, -ātia (spelling interchangeably in Medieval Latin, reflecting the Rom merger of the forms); these are in turn complexes of -āc- and -āt- -ate1 + -ia -y3 . Compare -cracy 1. accuracy
n. exactness;correctness 准确 *ac 例句：I doubt the accuracy of this report. 我怀疑这份报告的准确性。
2.advocacy
n. pleading in support 拥护，支持 *ad(=to),voc(=call,voice)
例句：The advocacy of environmental protection has become commercialized.拥护环保变成了一种商业化行为。
3.fallacy
n. false or mistaken belief 谬见；谬误 *fall(=err)
例句：It is complete fallacy that trading blocks will lead to economic regionalism.贸易壁垒将导致经济区主义的认识完全是一种谬误。
4.legacy
n. money,etc.to be received by a person under the sill of and at the death of another person 遗产，遗赠 *leg (=send)
例句：He retired as principal in 2005,leaving behind a legacy of educational excellence.他于2005年以校长 的身份退休，留下了卓越的教育遗产。