See also: Appendix:Variations of "rie" English English Wikipedia has an article on:RIEWikipedia Noun RIE (uncountable) Initialism of reactive ion etching. Ellipsis of RIE parenting.. From Acronym of resources for infant educarers.. From the trademark, for the organization that developed this parenting methodology. Anagrams ire, eir, IRE, IrE, rei, Ire., -ier, Eri, EIR, Eri.Wikiwand - on Seamless Wikipedia browsing. On steroids.