Longman Dictionary of Contemporary English homepage

exponential

 adjective
     
Related topics: Maths
ex‧po‧nen‧tial technical
1

exponential growth/increase etc

exponential growth, increase etc becomes faster as the amount of the thing that is growing increases:
an exponential increase in travel
2HM using a small number or letter slightly above and to the right of a number or letter that shows how many times a quantity is to be multiplied by itself
—exponentially adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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