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English definition of “proportion”

proportion

noun [C/U]  /prəˈpɔr·ʃən/ us  
a part or share of the whole, or the relationship between one thing and another in size, amount, or degree: [C] The proportion of the population that is over 65 has been growing. [pl] The occurrence of the disease has reached epidemic proportions. Proportion is also the right relationship between one thing and another: [U] His anger was out of all proportion to the offense (= was much too strong). art Proportion is also the correct relationship of the parts of a work of art to each other, especially in their size. mathematics A proportion is also a equation (= mathematical statement) that shows two ratios (= comparisons) are equal.
(Definition of proportion from the Cambridge Academic Content Dictionary © Cambridge University Press)
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