classify

verb (classifies, classifying, classified)

• arrange (a group of people or things) in classes or categories according to shared qualities or characteristics:mountain peaks are classified according to their shape
• assign (someone or something) to a particular class or category:elements are usually classified as metals or nonmetals
• designate (documents or information) as officially secret or to which only authorized people may have access:government officials classified 6.3 million documents in 1992