[ˈklasɪfʌɪ], (Verb)

Definitions:
- arrange (a group of people or things) in classes or categories according to shared qualities or characteristics
(e.g: mountain peaks are classified according to their shape)

- designate (documents or information) as officially secret
(e.g: government officials classified 6.3 million documents in 1992)


Phrases:

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