"proportional" in the noun sense
1. proportional
one of the quantities in a mathematical proportion
"proportional" in the adjective sense
1. proportional, relative
properly related in size or degree or other measurable characteristics usually followed by `to'
"the punishment ought to be proportional to the crime"
"earnings relative to production"
2. proportional
having a constant ratio
Source: WordNet® (An amazing lexical database of English)
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