[ ɪk'spəʊnənt , ɛk- ]
■ noun
1》 a promoter of an idea or theory.
2》 a person who does a particular thing skilfully.
3》 Mathematics the power to which a given number or expression is raised (e.g. 3 in 2 3 = 2 × 2 × 2).
4》 Linguistics a linguistic unit that realizes another, more abstract unit.
Origin
C16 (as adjective in the sense 'expounding'): from L. ~- , exponere (see expound ).