| n. | 1. | The act of forming into a class or classes; a distribution into groups, as classes, orders, families, etc., according to some common relations or affinities.
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| Noun | 1. | classification - the act of distributing things into classes or categories of the same type |
| 2. | classification - a group of people or things arranged by class or category Synonyms: categorisation, categorization | |
| 3. | classification - the basic cognitive process of arranging into classes or categories | |
| 4. | classification - restriction imposed by the government on documents or weapons that are available only to certain authorized people Antonyms: declassification - reduction or removal by the government of restrictions on a classified document or weapon |