- 1 a person who supports an idea, a theory, etc. and persuades others that it is good synonym proponent She was a leading exponent of free trade during her political career. Huxley was an exponent of Darwin's theory of evolution.
- 2a person who is able to perform a particular activity with skill the most famous exponent of the art of mime
- 3(mathematics) a raised figure or symbol that shows how many times a quantity must be multiplied by itself, for example the figure 4 in a4