vt.

1. 將……分類；將……分等級
   People who work in libraries spend a lot of time classifying books.

   在圖書館工作的人花大量的時間為書籍分類。

   Eggs are classified according to size.

   雞蛋按大小分等級。

2. 將……歸入某類（或某等級）
3. 【美】將（文件等）列入機密類
   The government has classified this information secret.

   政府已把這資料列為機密。

v.

1. arrange (a group) in classes or categories according to shared qualities or characteristics.
   ▸assign to a particular class or category.
2. designate (documents or information) as officially secret.