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English definition of “exponential”

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exponential

adjective uk   /ˌek.spəˈnen.ʃəl/ us    /-spoʊ-/

exponential adjective (INCREASE)

formal An exponential rate of increase becomes quicker and quicker as the thing that increases becomes larger: We are looking for exponential growth in our investment. There has been an exponential increase in the world population this century.

exponential adjective (NUMBER)

specialized mathematics containing an exponent (= a number or sign that shows how many times another number is to be multiplied by itself): 64 is an exponential expression.
exponentially
adverb uk   /-i/ formal us  
Malthus wrote about the risks involved in the world's population increasing exponentially.
(Definition of exponential from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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