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English definition of “proportional”

proportional

adjective uk   /prəˈpɔː.ʃən.əl/ us    /-ˈpɔːr-/ (also proportionate)
If two amounts are proportional, they change at the same rate so that the relationship between them does not change: Weight is proportional to size.Numerical relationships
proportionally
adverb uk   /-i/ (also proportionately) us  
Unemployment is proportionally much higher in the north of the country.Numerical relationships
(Definition of proportional from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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