classification

classification — noun

1. the activity of putting items, people, or ideas into groups based on shared feat

1.nounC2
Definition

the activity of putting items, people, or ideas into groups based on shared features or types that they have in common

Example

The biologist's careful classification of the new insect species took several months of analysis.

classification + of + noun phrase

For her dissertation, Priya studied the classification methods used in ancient Chinese medicine.

classification as a subject of study

Common collocations
  • classification of documents
  • classification of species
  • classification system
  • classification method
  • classification process
  • data classification
  • job classification
  • accurate classification
  • basic classification
Synonyms
  • categorisation

    very similar; categorisation often suggests sorting into named categories, while classification can imply a broader or more scientific system

  • sorting

    more general and concrete; sorting is what you do with physical items or basic data, less formal

  • grouping

    emphasises the act of putting things together by shared traits; less technical than classification

  • organisation

    broader; can cover any arrangement, not only by type

Antonyms
  • mixing

    combining items without sorting them by type

Grammar Patterns

classification + of + noun phrase

Usage Note

This uncountable sense refers to the action or system of classifying. It is often followed by of + noun phrase describing what is being sorted, or paired with system, method, or process.

Common Mistakes

The classification of these documents are tricky.
The classification of these documents is tricky.
classification is uncountable and takes a singular verb.
We need a classification for these files.' (when meaning a specific group)
We need to classify these files.
sense 1 is the process, not the resulting category.

2. a particular group or class into which someone or something is placed when items

2.nounC2
Definition

a particular group or class into which someone or something is placed when items are sorted by shared features or type

Example

This plant belongs to a classification known as tropical flowering evergreens.

belong to a classification

The report placed the country's economy under a new classification last year.

under a classification

Common collocations
  • belong to a classification
  • fall into a classification
  • under a classification
  • job classification
  • visa classification
  • security classification
  • different classification
  • same classification
  • new classification
Synonyms
  • category

    more common in everyday language; classification sounds more formal or technical

  • class

    overlapping; class is often used in social or biological contexts

  • type

    more general and less formal; type does not imply a formal sorting system

Grammar Patterns

classification + for + noun phrase

under a classification

belong to a classification

Usage Note

Countable — you can have one classification or several classifications. Frequently used with verbs like belong to, fall into, or place under. The specific classification is often named by an adjective or a noun modifier (e.g. visa classification, job classification).

Common Mistakes

This document is classification confidential.
This document has a confidential classification.
classification is a noun, not an adjective; use it with a determiner.

Word family

  • classify
    verbB2
  • classified
    adjectiveB1
  • classifiable
    adjectiveC1
  • classifier
    nounC1
  • reclassify
    verbC1
  • unclassified
    adjectiveC1

Synonym discussion

Sense: noun/1

All five words refer to putting items into sets, but they differ in formality, precision, and scope. Classification is the most formal and technical — it implies a systematic, often scientific or official framework with named classes (e.g. biological classification of species). Categorisation is equally formal but suggests that items are placed into pre-existing categories (e.g. library subject categorisation). Sorting is the most everyday and concrete — it can mean physically separating objects (sorting mail, sorting laundry) and does not require named categories. Grouping is in the middle: it focuses on gathering items by common features but does not imply a formal system (grouping students by ability). Arrangement is the broadest — it covers any kind of ordering, not only by type (arranging books by size). Use classification when the sorting follows an established system; use grouping or sorting for informal, everyday situations.

classification ↗categorisation ↗sortinggroupingarrangement ↗

Common collocations

Nouns

Adverbs

Phrases

  • classification of something into something
  • fall under a classification
  • classification by type

Prepositions

Etymology

LatinFrenchEnglish

Comes from French 'classification', which was built from Latin roots: 'classis' (a class or division of people) and the suffix '-fication' (making or doing). The word appeared in English in the late 1700s as scientific fields like biology and library science developed formal sorting systems.