itacismecommon nounSyllable DecompositionitacismeEtymologyexpandsee eta, -ism and m=yes, eta being pronounced /ita/ in Byzantine and modern Greek.Definition1. Pronunciation of eta as i. Iotacism is the pronunciation of epsilon and iota, eta, upsilon, upsilon and iota, omicron and iota as i.expandSee alsoitaciste (cn.) êta (cn.)