in some countries, a person with an official position in government, local government, etc.

Municipal presidents, aldermen (regidores), and syndics (síndicos), chosen by direct popular election, may not be reelected for the term immediately following. 由直接普选选出的市政主席、市议员 (regidores) 和商业代表 (síndicos) 不得连任下一任期。

in the UK, a person who helps deal with the business affairs of a university or other large public organization

He left to the Fitzwilliam Museum, of which he had been a syndic from 1934 to 1957, twenty-four works by Degas. 他向剑桥菲茨威廉博物馆捐赠了二十四幅德加的画作，一九三四到一九五七年间，他曾是这座博物馆的财务理事。

a member of a committee (= a small group of people that makes decisions or collects information for a larger organization) at the University of Cambridge who deals with matters affecting Cambridge University Press, for example as to which books are published

The syndics of the Cambridge press were proposing to re-edit Thomas Stanley's Aeschylus. 剑桥大学出版社的编审人员提议重新编辑托马斯·斯坦利的《埃斯库罗斯》。