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English definition of “proportional”

proportional

adjective     /prəˈpɔːʃənəl/ (also proportionate)
if two amounts are proportional, they change at the same rate, so that the relationship between them does not change: proportional to sth They introduced an annual property tax proportional to the market value of the property.
directly proportional (to sth) if two amounts are directly proportional, when one increases, the other increases and when one goes down, the other goes down: CO2 emissions from motor vehicles are directly proportional to the amount of fuel consumed and its carbon content.
inversely proportional (to sth) if two amounts are inversely proportional, when one increases, the other goes down and when one goes down, the other increases: E-business knowledge is generally inversely proportional to both age and rank in the organisation.
(Definition of proportional adjective from the Cambridge Business English Dictionary © Cambridge University Press)
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