I. prə-ˈpȯr-shnə1, -shə-n ə l noun
Date: 14th century
: a number or quantity in a proportion
II. adjective
Date: 15th century
1.
a. : corresponding in size, degree, or intensity
b. : having the same or a constant ratio
corresponding sides of similar triangles are proportional
2. : regulated or determined in size or degree with reference to proportions
a proportional system of immigration quotas
• pro·por·tion·al·i·ty -ˌpȯr-shə-ˈna-lə-tē noun
• pro·por·tion·al·ly -ˈpȯr-shnə-lē, -shə-n ə l-ē adverb