verb (classifies, classifying, classified) with object

arrange (a group of people or things) in classes or categories according to shared qualities or characteristics:

«グループなどに/…として» …を分類する, 類別する «into, in/as» ; …を等級に分ける (!しばしば受け身で)

e.g. mountain peaks are classified according to their shape.

assign (someone or something) to a particular class or category:

e.g. elements are usually classified as metals or nonmetals.

designate (documents or information) as officially secret or to which only authorized people may have access:

〈情報･文書など〉を機密扱いにする(↔ declassify)

e.g. government officials classified 6.3 million documents in 1992.

classifiable | ˈˌklasəˈfīəbəl | adjective

classificatory | -fikəˌtôrē | adjective

late 18th century: back-formation from classification, from French, from classe ‘class’, from Latin classis ‘division’.