[] a large important organization that has a particular purpose, for example a bank （银行等规模大的）机构◆a banking/an investment/a lending institution 银行／投资／贷款机构◆The sale has already been accepted by the big City institutions(= the banks and finance companies in London). 这个销售项目已得到伦敦的大银行和金融机构的认可。◆the Royal Institution of Chartered Surveyors 英国皇家特许测量师学会
[] a custom or system that has existed for a long time among a particular group of people （由来已久的）风俗习惯，制度◆The Web as an institution seems more important than ever. 万维网作为一种习惯似乎比以往更重要。
[] the act of starting or introducing sth such as a system or a law 建立；设立；制订◆the institution of new safety procedures 新安全措施的制订