exponent

n. one who interprets, advocate; small raised symbol or number placed after a number that indicates the power to which the number is raised (Mathematics)

Exponentiation is a mathematical operation, written an, involving two numbers, the base a and the exponent n. When n is a positive integer, exponentiation corresponds to repeated multiplication:just as multiplication by a whole number corresponds to repeated addition:The exponent is usually shown as a superscript to the right of the base. The exponentiation an can be read as: a raised to the n-th power or a raised to the power n, or more briefly: a to the n-th power or a to the power n. Some exponents can be read in a certain way; for example a2 is usually read as a squared and a3 as a cubed.
See more at Wikipedia.org...

n. exponent, one who interprets or expounds; (Algebra) small superscript symbol or number placed after a number indicating the power to which that number is raised

n. exponent, one who interprets, advocate; small raised symbol or number placed after a number that indicates the power to which the number is raised (Mathematics)

(n.)
One who, or that which, stands as an index or representative; as, the leader of a party is the exponent of its principles.
  

(n.)
A number, letter, or any quantity written on the right hand of and above another quantity, and denoting how many times the latter is repeated as a factor to produce the power indicated