资料来源 : Webster's Revised Unabridged Dictionary (1913)

Exponential \Ex`po*nen"tial\, a. [Cf. F. exponentiel.]
   Pertaining to exponents; involving variable exponents; as, an
   exponential expression; exponential calculus; an exponential
   function.

   {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} (Math.), a quantity whose exponent is
      unknown or variable, as a^{x}.

   {Exponential series}, a series derived from the development
      of exponential equations or quantities.

资料来源 : WordNet®

exponential series
     n : a series derived from the expansion of an exponential
         expression