The Collaborative International Dictionary of English v.0.48:
Epideictic \Ep`i*deic"tic\, a. [Gr. ?, fr. ? to show forth, display; 'epi` + ? to show. Cf. Epidictic.] Serving to show forth, explain, or exhibit; -- applied by the Greeks to a kind of oratory, which, by full amplification, seeks to persuade. EpidemicWordNet (r) 3.0 (2006):
epideictic adj 1: designed primarily for rhetorical display; "epideictic orations" [syn: epideictic, epideictical]