D defs.my
Entry 2 senses Webster, 1913

Exponential

/ĕk-spō-nĕn'-chəl/ · Ex·po·nen·tial · IPA /ˌɛk.spəˈnɛn.t͡ʃəl/
01 a. Pertaining to exponents; involving variable exponents; as, an exponential expression; exponential calculus; an exponential function.
  1. 1.
    Pertaining to exponents; involving variable exponents; as, an exponential expression; exponential calculus; an exponential function.
  2. 2.
    changing over time in an exponential manner, i. e. increasing or decreasing by a fixed ratio for each unit of time; as, exponential growth; exponential decay.
Phrases & compounds
Exponential curve — a curve whose nature is defined by means of an exponential equation.
Exponential equation — an equation which contains an exponential quantity, or in which the unknown quantity enters as an exponent.
Exponential quantity — a quantity whose exponent is unknown or variable, as ax.
Exponential series — a series derived from the development of exponential equations or quantities.