n. 〔想法、信仰等的〕倡导者,鼓吹者 ≈ proponent
n. 能手,大师
n. 指数,幂
She was a leading exponent of free trade during her political career. 她从政期间是自由贸易的主要倡导者。
BrE /əˌbriːviˈeɪʃn/