ˌɛk.spəʊ.ˈnɛn.tʃəl ˌɛk.spoʊ.ˈnɛn.tʃəl ˌɛk.spəʊ.ˈnɛn.tʃəl ˌɛk.spoʊ.ˈnɛn.tʃəl of or involving exponents exponential growth a function in which an independent variable appears as an exponent