olemus
(a) kontekstist sõltuv mõõdukooskõla
Merriam-Webster:
1a: corresponding in size, degree, or intensity
ISO/IE TR 24714:
tasakaal isiku huvide ja organisatsiooni huvide vahel
= balance between the interests of an individual and the interests of an organisation
https://en.wikipedia.org/wiki/Aspect_ratio
https://en.wikipedia.org/wiki/Proportional_division
https://en.wikipedia.org/wiki/Proportionality_(law)
https://en.wikipedia.org/wiki/Proportion_(architecture)
https://en.wikipedia.org/wiki/Body_proportions

(b) võrdelisus
Merriam-Webster:
1b: 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
https://www.mathsisfun.com/algebra/directly-inversely-proportional.html
https://en.wikipedia.org/wiki/Proportionality_(mathematics)
https://en.wikipedia.org/wiki/Proportional_control
https://en.wikipedia.org/wiki/Proportional_representation