classify
B2Formal, Neutral
Definition
Meaning
To arrange or organize things into groups based on shared characteristics or qualities.
To designate information, documents, or materials as confidential or secret, typically by a government; to categorize systematically.
Linguistics
Semantic Notes
The verb implies a systematic or official act of categorization. It often carries a sense of imposing order based on objective criteria. When used for information, it has a specific legal/security meaning.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Spelling of derived forms follows regional conventions (e.g., 'classifies', 'classifying', 'classified').
Connotations
Neutral in both varieties. In governmental/security contexts, it carries the same formal weight.
Frequency
Equally common and used in identical contexts in both varieties.
Vocabulary
Collocations
Grammar
Valency Patterns
classify + object (e.g., classify animals)classify + object + as + noun/adjective (e.g., classify it as secret)classify + object + into + category (e.g., classify them into types)be classified + as/by (e.g., is classified as hazardous)Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “[No common idioms with 'classify' as the headword]”
Usage
Context Usage
Business
Classifying expenses for tax purposes; classifying data for customer segmentation.
Academic
Classifying species in biology; classifying literary genres; classifying types of research.
Everyday
Classifying laundry into whites and colours; classifying books on a shelf.
Technical
Classifying security levels of documents; classifying minerals by hardness; classifying algorithms.
Examples
By Part of Speech
verb
British English
- Biologists classify the newly discovered insect in the Coleoptera order.
- The cabinet decided to classify the findings to protect national security.
American English
- Librarians classify new books using the Dewey Decimal System.
- The government agency classified the document as 'Top Secret'.
adverb
British English
- [No direct adverb form. Use 'in a classified manner' or related adverb from participle.] The data was stored classifiedly. [Rare/Unnatural. Prefer: '...stored as classified data.']
American English
- [No direct adverb form. Use 'in a classified manner' or related adverb from participle.] The report was marked classifiedly. [Rare/Unnatural. Prefer: '...marked as classified.']
adjective
British English
- [From the derived adjective 'classified'] The advertisement was placed in the classified section of the newspaper.
- Access to the classified information was strictly controlled.
American English
- [From the derived adjective 'classified'] She found a job through the classified ads.
- He held a high-level security clearance for classified materials.
Examples
By CEFR Level
- We classify the toys: cars here, dolls there.
- The teacher asked us to classify the pictures as animals or food.
- Scientists classify plants based on their flowers and seeds.
- How would you classify this film—is it a comedy or a drama?
- The new software can automatically classify emails as important or spam.
- Documents relating to the ongoing investigation have been officially classified.
- The philosopher's work is difficult to classify within a single school of thought.
- The committee's findings were immediately classified, sparking debate about government transparency.
Learning
Memory Aids
Mnemonic
Think of a CLASS: you put students into different CLASSes. To CLASSIFY is to put things into their 'classes' or groups.
Conceptual Metaphor
ORGANIZATION IS STRUCTURE (building a system of categories); KNOWLEDGE IS A LIBRARY (placing items on specific shelves).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid using 'классифицировать' for simple, informal sorting (e.g., sorting socks). It is better for formal, systematic categorization.
- Do not confuse with 'qualify' (соответствовать требованиям). 'Classify' is about groups, not meeting standards.
Common Mistakes
- Incorrect: 'They classified the documents like secret.' Correct: 'They classified the documents as secret.'
- Incorrect: 'We need to classify between types.' Correct: 'We need to classify/differentiate between types.' (Classify takes a direct object, not 'between')
Practice
Quiz
In which context is the word 'classify' used most specifically?
FAQ
Frequently Asked Questions
The main noun forms are 'classification' (the process or result) and 'classifier' (a person or thing that classifies).
It is primarily an action verb, describing the deliberate act of categorizing. However, in its passive form ('is classified as'), it can describe a state.
They are very close synonyms. 'Classify' often implies a more formal, systematic, or scientific system of categories (e.g., biological taxonomy). 'Categorize' can be used in slightly broader, sometimes less formal contexts.
Yes, when referring to the ongoing activity. For example: 'The archivist is still classifying the old letters.'