incommensurable
C2Formal, academic, philosophical, mathematical
Definition
Meaning
Not comparable in size, value, or standard; lacking a common basis for measurement or comparison.
Describing entities, ideas, or systems so fundamentally different that they cannot be judged by the same criteria or reduced to a common metric.
Linguistics
Semantic Notes
Primarily used in philosophical, ethical, and mathematical contexts to denote fundamental qualitative difference, not just a large quantitative gap. It implies a break in common measure, not merely a difficult comparison.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning or usage. Spelling follows the British double 'm' pattern. Frequency of use is equally low in both varieties.
Connotations
Identical connotations of abstract, fundamental difference, often with a philosophical weight.
Frequency
Very low frequency in both dialects, primarily confined to specialised academic discourse.
Vocabulary
Collocations
Grammar
Valency Patterns
[Noun Phrase] is incommensurable with [Noun Phrase]incommensurable valuesVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “[No common idioms; the word itself is often part of technical phrases]”
Usage
Context Usage
Business
Rare. Potentially used in high-level strategy discussions about merging companies with 'incommensurable' corporate cultures.
Academic
Common in philosophy of science, ethics, and mathematics to describe paradigms or values that cannot be measured against each other.
Everyday
Extremely rare. Would sound highly technical or pretentious.
Technical
Core term in mathematics (numbers with no common measure, e.g., π and 1) and philosophy (Kuhn's incommensurable paradigms).
Examples
By Part of Speech
adjective
British English
- The utilitarian and deontological frameworks were seen as incommensurable, making a simple ethical calculus impossible.
American English
- The historian argued that the worldviews of the medieval and modern eras were fundamentally incommensurable.
Examples
By CEFR Level
- The two artists' styles are so different they're almost incommensurable.
- Kuhn's theory suggests that scientific paradigms before and after a revolution are incommensurable, preventing direct theory comparison.
Learning
Memory Aids
Mnemonic
Think: IN- (not) + COMMENSURABLE (able to be measured together). If you try to measure the beauty of a sunset with a ruler, your tools are INCOMMENSURABLE with the task.
Conceptual Metaphor
COMPARISON IS MEASUREMENT. This word negates that metaphor, stating that no common 'ruler' or 'scale' exists for the comparison.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid confusing with 'несоизмеримый' which is correct but highly bookish. A more common trap is over-translating as 'несравнимый' (incomparable), which lacks the specific philosophical/mathematical nuance of lacking a common unit of measure.
Common Mistakes
- Using it to mean simply 'very large' instead of 'lacking a common basis for comparison'.
- Misspelling as 'incomensurable' (single 'm').
- Using it in informal contexts where 'incompatible' or 'different' would suffice.
Practice
Quiz
In mathematics, which pair is classically described as 'incommensurable'?
FAQ
Frequently Asked Questions
No. It means 'so fundamentally different that they share no common standard for measurement or comparison.' It's a stronger, more technical term used in philosophy and science.
Yes, though less common. In mathematics, you can refer to 'incommensurables' (e.g., 'the discovery of incommensurables by the Pythagoreans').
'Incompatible' means things cannot exist or work together. 'Incommensurable' means they cannot be measured or judged by the same criteria, even if they coexist.
No, there is no standard verb form. The related verb is 'to commensurate' (to reduce to a common measure), from which 'incommensurable' is derived via negation.