1706, from Latin exponentem (nominative exponens), present participle of exponere "put forth" (see expound). A mathematical term at first; the sense of "one who expounds" is 1812. As an adjective, from 1580s.
A number placed above and to the right of another number to show that it has been raised to a power. For example, 32 indicates that 3 has been raised to a power of 2, or multiplied by itself; 32 is equal to 9.
programming
(Or "characteristic") The part of a floating-point number specifying the power of ten by which the mantissa should be multiplied. In the common notation, e.g. 3.1E8, the exponent is 8.
(1995-02-27)