Definition

1. Noun:
   • The basic cognitive process of arranging into classes or categories: The act or method of systematically grouping things based on shared characteristics or qualities.
   • The act of distributing things into classes or categories of the same type: The process of assigning items to specific, defined groups.
   • A group of people or things arranged by class or category: The resulting system or scheme of categories created by the process of classification.
   • Restriction imposed by the government on documents or weapons that are available only to certain authorized people: A security designation limiting access to information or material (e.g., "Top Secret").

Usage and Examples

• Referring to the process:

  • The classification of plants and animals is a fundamental part of biology.
  • Her job involves the classification of library books according to the Dewey Decimal System.

• Referring to the resulting system:

  • This chart shows the classification of living organisms into kingdoms and phyla.
  • The new classification of employees into different pay grades was announced.

• Referring to a security level:

  • The document has a "Confidential" classification.
  • Access to that information requires a high-level security clearance due to its classification.

Advanced Usage

• "to defy classification": To be difficult or impossible to categorize neatly.
  • His unique artistic style defies easy classification.
• "broad/narrow classification": Referring to the scope or specificity of the categories.
  • "Vertebrate" is a broad classification, while "sparrow" is a very narrow one.

Variants and Related Words

• Classify (verb): To arrange or assign to a category.
  • Scientists classify newly discovered species.
• Classifier (noun): A person or thing that classifies; in linguistics, a word indicating the class of a noun.
• Classifiable (adjective): Able to be classified.
• Reclassification (noun): The act of classifying something again or differently.

Synonyms

• Categorization: The action of placing into categories.
• Taxonomy: The science or practice of classification, especially in biology.
• Sorting: The process of separating and arranging into groups.
• Grading: Arranging in levels or ranks (often by quality).

Related Phrases

• Classification system/scheme: The structured set of categories used for organizing things.
  • The Köppen climate classification system is used by geographers.
• Security classification: The official level of secrecy assigned to government information.
  • The report's security classification was downgraded after ten years.

Idioms and Common Expressions

• "In a class of its own": So good or unique that it cannot be compared to others (related conceptually to the idea of classification).
  • As a pianist, she is in a class of her own.

Noun

1. restriction imposed by the government on documents or weapons that are available only to certain authorized people
2. the basic cognitive process of arranging into classes or categories
3. a group of people or things arranged by class or category
4. the act of distributing things into classes or categories of the same type