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epideictic

British  
/ ˌɛpɪˈdaɪktɪk /

adjective

  1. Also: epidictic.  designed to display something, esp the skill of the speaker in rhetoric

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of epideictic

C18: from Greek epideiktikos, from epideiknunai to display, show off, from deiknunai to show