1. 用作描述符的一種字、符號或數(shù)，用于從某一集合中，特別是從某一配位標(biāo)引系統(tǒng)中檢索信息
   A word, symbol, or number used as a descriptor for retrieval of information from a collection, especially in a coordinate indexing system.
2. 為存儲和檢索數(shù)據(jù)項或數(shù)據(jù)，把搜索關(guān)鍵字轉(zhuǎn)換為一個地址的一種方法。該方法常用于減少搜索時間。
   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.
3. 情報［信息］檢索中用于對信息分類或索引的詞。同keyword。
   In information retrieval, a word used to categorize or index information.
4. 數(shù)據(jù)媒體的初始化，使某一特定計算機(jī)系統(tǒng)能將數(shù)據(jù)存在媒體中，隨后又可從該媒體中檢索出來。
   The initialization of a data medium such that a particular computer system can store data in and subsequently retrieve data from the medium.

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