An Exponent

1. One who expounds, represents or advocates.
2. (mathematics) The number by which a value (called the base) is said to be raised to a power in exponentiation

Synonym: power

3. (mathematics, obsolete) The degree to which the root of a radicand is found

Synonyms: degree, power

4. (linguistics) A manifestation of a morphosyntactic property.
5. (computing) The part of a floating-point number that represents its exponent value.