A mathematical notation indicating the number of times a quantity is multiplied by itself WordNet 3.0 & Open English WordNet

The part of a floating-point number that represents its exponent value. Wiktionary

A prologue indicating what follows. Wiktionary

A product of equal factors (and generalizations of this notion): x n , read as " x to the power of n " or the like, is called a power and denotes the product x × x × ⋯ × x , where x appears n times in the product; x is called the base and n the exponent. Wiktionary