Exponential

[,ekspə'nenʃ(ə)l] or ['ɛkspə'nɛnʃəl]

(noun.) a function in which an independent variable appears as an exponent.

(adj.) of or involving exponents; 'exponential growth' .

Checker: Williams--From WordNet

(a.) Pertaining to exponents; involving variable exponents; as, an exponential expression; exponential calculus; an exponential function.

Checked by Ives