exponent

US /ɪkˈspoʊ.nənt/
UK /ɪkˈspoʊ.nənt/
"exponent" picture
1.

a person who believes in and promotes the truth or benefits of an idea or theory

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He was a leading exponent of the new economic theory.
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She is a strong exponent of environmental protection.
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advocateproponentsupporterchampionspokesperson
2.

a quantity representing the power to which a given number or expression is to be raised, usually expressed as a raised symbol beside the number or expression

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In the expression x², 2 is the exponent.
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The number 10³ has an exponent of 3.
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powerindex