1821, "one who takes part in an exhibition;" psychosexual sense is from 1893, in Craddock's translation of Krafft-Ebing; see exhibition + -ist. Related: Exhibitionism (1893); exhibitionistic (1928). Exhibitioner is from 1670s in the English university sense.
exhausted
exhaustion
exhaustive
exhibit
exhibition
exhibitionist
exhibitor
exhilarate
exhilaration
exhort
exhortation