Main Entry: ex·po·nen·tial

Pronunciation: \ˌek-spə-ˈnen-chəl\

Function: adjective

Date: 1704

1 : of or relating to an exponent
2 : involving a variable in an exponent <10^x is an exponential expression>
3 : expressible or approximately expressible by an exponential function; especially : characterized by or being an extremely rapid increase (as in size or extent) <an exponential growth rate>

— ex·po·nen·tial·ly \-ˈnench-(ə-)lē\ adverb