impurity
C1Formal/Technical/General
Definition
Meaning
The state or quality of being impure, containing something that spoils the purity or quality of a substance or concept.
A substance or element that makes something else impure; a morally wrong or corrupt element.
Linguistics
Semantic Notes
Predominantly used as a countable noun for a contaminating substance and as an uncountable noun for the state of being impure. The figurative/moral sense is less common but valid.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Spelling is consistent. 'Foreign matter' is a common technical alternative in both.
Connotations
Both share primary technical and secondary moral connotations.
Frequency
Slightly more frequent in UK English due to historical industrial/chemical texts, but the difference is negligible in modern usage.
Vocabulary
Collocations
Grammar
Valency Patterns
impurity in + [noun] (e.g., impurity in the water)impurity of + [noun] (e.g., impurity of the substance)impurity + [verb] (e.g., impurities were found)Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “[No common idioms directly use 'impurity'. Related: 'to purify something of impurities']”
Usage
Context Usage
Business
Refers to contaminants in manufacturing processes or supply chains, e.g., 'The batch was rejected due to an unacceptable level of impurities.'
Academic
Common in chemistry, materials science, and philosophy/ethics. Discusses trace elements in samples or moral/spiritual corruption.
Everyday
Used when discussing water filters, food quality, or occasionally in moral discussions about art or character.
Technical
Precise term in semiconductor physics, metallurgy, and chemistry for atoms that disrupt a crystal lattice or chemical compound.
Examples
By Part of Speech
verb
British English
- The process is designed to impurity the compound, making it less reactive. (RARE/Technical)
American English
- The scandal served to impurity the institution's reputation. (RARE/Figurative)
adverb
British English
- [No standard adverb form. Use 'impurely'.]
American English
- [No standard adverb form. Use 'impurely'.]
adjective
British English
- [No standard adjective form. Use 'impure'.]
American English
- [No standard adjective form. Use 'impure'.]
Examples
By CEFR Level
- The water had an impurity, so we didn't drink it.
- The gold was valuable, but it contained some small impurities.
- Scientists must remove all metallic impurities from the silicon to make efficient solar cells.
- The novel explores the thematic impurity of the genre, blending detective fiction with metaphysical poetry.
Learning
Memory Aids
Mnemonic
Think of 'IM' as 'IN' (not) + 'PURITY'. Something with an impurity is NOT pure. Imagine a 'purity' sign with a big 'IM' (I am) crossing it out.
Conceptual Metaphor
PURITY IS CLEANLINESS / MORALITY IS CLEANLINESS. An impurity is a 'stain', 'spot', or 'dirt' on a physical object or a person's character.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid translating directly as 'нечистота' in technical contexts (use 'примесь', 'загрязнение'). 'Impurity' is more formal than 'грязь'. The moral sense ('скверна') is literary/archaic in English but common in Russian.
Common Mistakes
- Using 'impurity' as an adjective (e.g., 'impurity water') instead of 'impure water'. Confusing 'impurity' (noun) with 'impurely' (adverb).
Practice
Quiz
In which context is 'impurity' LEAST likely to be used?
FAQ
Frequently Asked Questions
Typically yes, as it implies a deviation from a desired pure state. However, in some alloy production, specific impurities are deliberately added to change material properties.
It is very rare and potentially offensive to refer directly to a person as 'an impurity'. It is used abstractly for 'elements' within a group (e.g., 'purge impurities from the party'), but this is a figurative, often polemical usage.
They are often synonyms. 'Contaminant' often implies an external source causing harm or pollution. 'Impurity' can be an inherent or native minor component that makes something less than 100% pure (e.g., nitrogen is an impurity in some grades of argon gas).
It's pronounced like the 'pu' in 'pure' /ˈpjʊər/. In British English, it's /ɪmˈpjʊər.ə.ti/. In American English, the 'r' is more pronounced and the 't' is often flapped: /ɪmˈpjʊr.ə.t̬i/.
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