ex·po·nen·tial 
(ĕk′spə-nĕnshəl)
(ĕk′spə-nĕnshəl)adj.
1. Of or relating to an exponent.
2. Mathematics
a. Containing, involving, or expressed as an exponent.
b. Expressed in terms of a designated power of e, the base of natural logarithms.
ex′po·nential·ly adv.