kappa
LowFormal, Academic, Technical
Definition
Meaning
The tenth letter of the Greek alphabet (Κ, κ).
A statistical measure of inter-rater agreement or reliability; a type of particle in physics (κ meson); a symbol for various constants in mathematics and science; a term for a type of mythical water-dwelling creature in Japanese folklore.
Linguistics
Semantic Notes
Meaning is highly context-dependent. In everyday English, it is rare and usually refers to the Greek letter. In specialized fields (statistics, physics, mythology), it takes on specific technical meanings.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Spelling is identical.
Connotations
None beyond its technical or academic connotations.
Frequency
Equally rare in both varieties outside of technical contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
The kappa was calculated.Kappa is a measure of agreement.The symbol kappa represents...Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “None”
Usage
Context Usage
Business
Virtually unused, except potentially in advanced analytics or research reporting.
Academic
Common in statistics, psychology, physics, and engineering papers.
Everyday
Extremely rare. Might be encountered when discussing the Greek alphabet.
Technical
Frequent in specific fields: 'Cohen's kappa' in statistics, 'kappa meson' in particle physics, 'kappa number' in pulp/paper chemistry.
Examples
By Part of Speech
adjective
British English
- The kappa value was significant.
- He studied kappa meson decay.
American English
- The kappa statistic was reported.
- Research on kappa particles continued.
Examples
By CEFR Level
- Kappa is a letter in the Greek alphabet.
- In the word list, alpha, beta, and kappa are all Greek letters.
- The researcher used Cohen's kappa to assess the reliability of the diagnoses.
- A kappa value above 0.8 generally indicates excellent inter-rater agreement beyond chance.
Learning
Memory Aids
Mnemonic
Imagine a CAP being pulled down over the letter 'K' to turn it into the curved Greek letter Kappa.
Conceptual Metaphor
MEASURE IS A TOOL (for kappa statistic); LETTER IS A SYMBOL.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with the Russian word 'каппа' (kapa), which is a direct transliteration and carries the same Greek letter meaning. The statistical term is the same in Russian academic contexts ('каппа Коэна'). The Japanese folklore creature is also called 'каппа'.
Common Mistakes
- Misspelling as 'kapa' or 'cappa'.
- Incorrectly capitalising it in phrases like 'Cohen's Kappa'.
- Using it without necessary context, leaving the meaning unclear.
Practice
Quiz
In which of these contexts is 'kappa' LEAST likely to be used?
FAQ
Frequently Asked Questions
Yes, it is a loanword from Greek, fully integrated into English, primarily for naming the letter and in technical terminology.
It is a metric, often called Cohen's kappa, that measures the level of agreement between two raters, correcting for agreement expected by chance.
It is pronounced /ˈkæp.ə/, rhyming with 'rapper'.
It is a mythical, mischievous water creature often depicted as a child-sized being with a water-filled dish on its head.