What is "epexegesis"

Epexegesis \Ep*ex`e*ge"sis\, n. [NL., fr. Gr. ? detailed narrative, fr. ? to recount in detail; 'epi` + ? to lead, point out. See Exegesis.] A full or additional explanation; exegesis.

"words added to convey more clearly the meaning intended," 1620s, from Modern Latin, from Greek epexegesis "a detailed account, explanation," from epi "in addition" (see epi-) + exegeisthai "to explain" (see exegesis). Related: Epexegetic; epexegetical.

n. (context rhetoric English) An additional explanation or explanatory material.