ex‧po‧nen‧tial /ˌekspəˈnenʃəl◂/ adjective 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

2. 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

[TahlilGaran] Dictionary of Contemporary English ▲