1. 成員組織；附屬機構；分會
    An affiliate is an organization which is officially connected with another, larger organization or is a member of it.

    e.g. ...twelve companies, including three affiliates of a Texas oil firm...
           12家公司，包括得克薩斯一家石油公司的3家分公司
    e.g. The World Chess Federation has affiliates in around 120 countries.
           國際象棋聯(lián)合會在大約120個國家設有分支機構。

2. 隸屬于;并入
    If an organization affiliates to or with another larger organization, it forms a close connection with the larger organization or becomes a member of it.

    e.g. All youth groups will have to affiliate to the National Youth Agency...
           所有青年團體必須并入全國青年事務處。
    e.g. The Government will not allow the staff association to affiliate with outside unions.
           政府不會允許其公務員協(xié)會與外部工會有緊密聯(lián)系。

3. （醫(yī)生或律師等專業(yè)人士）與…有正式關系
    If a professional person such as a lawyer or doctor affiliates with an organization, they become officially connected with that organization.

affiliate的近義詞

    e.g. He said he wanted to affiliate with a U.S. firm because he needed 'expert advice and counsel in legal affairs'.
           他說他因為需要“在法律事務上得到專家的意見和建議”，所以想與一家美國律師事務所建立合作關系。