proportionality

UK: /ˌprəpɔːʃəˈnælɪtɪ/

WordReference Random House Learner's Dictionary of American English © 2025

pro•por•tion•al /prəˈpɔrʃənəl/   adj. 

1. of or relating to proportion or proportions.
2. in the correct or balanced relation or proportion:
   [be + ~ + to] Salary raises were proportional to the cost of living.
See -par-.

WordReference Random House Unabridged Dictionary of American English © 2025

pro•por•tion•al  (prə pôr′shə nl, -pōr′-), adj. 

1. having due proportion;
   corresponding.
2. being in or characterized by proportion.
3. of, pertaining to, or based on proportion;
   relative.
4. Mathematics
   • Mathematics (of two quantities) having the same or a constant ratio or relation:
     The quantities
     y and x are proportional if y/x = k, where k is the constant of proportionality.
   • Mathematics (of a first quantity with respect to a second quantity) a constant multiple of:
     The quantity
     y is proportional to x if y = kx, where k is the constant of proportionality.

• Latin prōportiōnālis. See proportion, -al¹
• Middle English proporcional 1350–1400

pro•por′tion•al′i•ty, n. 
pro•por′tion•al•ly, adv. 
Synonyms

• 1. harmonious, comparative, accordant, consonant, proportionate.