用作描述符的一种字、符号或数，用于从某一集合中，特别是从某一配位标引系统中检索信息 A word, symbol, or number used as a descriptor for retrieval of information from a collection, especially in a coordinate indexing system.
为存储和检索数据项或数据，把搜索关键字转换为一个地址的一种方法。该方法常用于减少搜索时间。 A method of transforming a search key into an address for the purpose of storing and retrieving items or data. The method is often designed to minimize the search time.
情报［信息］检索中用于对信息分类或索引的词。同keyword。 In information retrieval, a word used to categorize or index information.
数据媒体的初始化，使某一特定计算机系统能将数据存在媒体中，随后又可从该媒体中检索出来。 The initialization of a data medium such that a particular computer system can store data in and subsequently retrieve data from the medium.
