say it: ek-spoh-NEN-shuhl
exponential is a noun and adjective meaning "a function in which an independent variable appears as an exponent". It carries 2 recorded senses.
a function in which an independent variable appears as an exponent
of or involving exponents
“exponential growth”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for exponential come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.