exponent

Short definition from Wiktionary

Noun

1. 1
   One who expounds, represents or advocates.
2. 2
   The number by which a value (called the base) is said to be raised to a power in exponentiation: for example, the 3 in 2³=8.
3. 3
   The degree to which the root of a radicand is found, for example, the 2 in ^(2])√=b.
4. 4
   A manifestation of a morphosyntactic property.
5. 5
   The part of a floating-point number that represents its exponent value.