(usu + of) somebody or something that expounds or interprets
(usu + of) somebody or something that advocates or exemplifies something
a skilled performer, artist, etc
a symbol written above and to the right of a mathematical expression to indicate the number of times a quantity is multiplied by itself, e.g. 23 = 2 × 2 × 2
[Latin exponent-, exponens, present part. of exponere: see expose]