kation
C2Technical/Scientific
Definition
Meaning
An ion with a positive electric charge, formed by the loss of electrons from an atom or molecule. It is attracted to the cathode (negative electrode) in electrolysis.
In a broader or metaphorical sense, can be used to refer to any positively charged center or source of attraction, though this usage is rare and highly technical.
Linguistics
Semantic Notes
The term is part of the fundamental pair 'cation/anion' in electrochemistry and physics. Its meaning is almost exclusively tied to its technical definition and lacks common figurative uses.
Dialectal Variation
British vs American Usage
Differences
No significant lexical or conceptual differences. Pronunciation may have minor variations in stress or vowel length, but the core scientific definition is identical.
Connotations
None beyond its technical meaning.
Frequency
Frequency is identical, confined entirely to scientific and technical contexts in both varieties.
Vocabulary
Collocations
Grammar
Valency Patterns
The <cation> is attracted to the cathode.<Cation> concentration affects the process.A <cation> of sodium (Na+).Vocabulary
Synonyms
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Virtually never used.
Academic
Core term in chemistry, physics, biochemistry, and materials science.
Everyday
Extremely rare, only in very specific educational contexts.
Technical
Fundamental and frequent term in electrochemistry, battery technology, soil science, and physiology (e.g., ion channels).
Examples
By Part of Speech
adjective
British English
- The cationic polymer improved the filtration.
- Cationic surfactants are used in fabric softeners.
American English
- The cationic charge was measured directly.
- A cationic dye was applied to the sample.
Examples
By CEFR Level
- In the experiment, the cation moved towards the negative wire.
- Sodium chloride dissolves in water to form a sodium cation and a chloride anion.
- The soil's fertility is influenced by the balance of cations like calcium and magnesium.
- The selectivity of the ion channel is predicated on the precise hydration radius of the permeant cation.
- Cation-exchange capacity is a critical property of clays and humic substances in agronomy.
Learning
Memory Aids
Mnemonic
Remember: a cat-ion is "paws-itive." A cation has a positive (+) charge.
Conceptual Metaphor
A traveller moving towards a negative destination (cathode).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'катание' (riding, skating).
- The English word is a scientific term derived from Greek 'kata' (down); the Russian equivalent is 'катион' (katión), which is a direct cognate.
Common Mistakes
- Misspelling as 'cation' (without the 'i') or 'kation' (though 'kation' is a valid but less common spelling variant, especially in older or German-influenced texts).
- Incorrect stress: it's CAT-ion, not ca-TION.
Practice
Quiz
Which of the following is a cation?
FAQ
Frequently Asked Questions
A cation has a positive charge (lost electrons), an anion has a negative charge (gained electrons). In an electric field, cations move to the cathode (negative), anions to the anode (positive).
Almost never. It is a specialised scientific term. In non-technical conversation, one might say 'positive ion' if necessary, but the context would still be scientific.
It is pronounced as CAT-eye-on (/ˈkætaɪən/). The main stress is on the first syllable.
In modern English scientific writing, 'cation' is the overwhelmingly standard spelling. 'Kation' is an older or Germanic spelling variant and is not recommended for use in contemporary English texts.