From Longman Dictionary of Contemporary Englishrere1 /riː/ preposition written formalABOUTused in business letters to introduce the subjectre your enquiry of the 19th October► see thesaurus at aboutExamples from the Corpusre• To: JohnDeacon. From: Maria Soames. Re: computer system.• Replanningmeeting on Friday, pleasebringsalesfigures.• re your e-mail datedNovember 27threre2 /reɪ/ noun [singular]the secondnote in a musicalscale →sol-fare-re- /riː/ prefix1AGAINagainThey’re rebroadcasting the play.2AGAINagain in a better wayShe asked me to redo the essay.3PASTback to a formerstateAfter years of separation they were finally reunited.'re're /ə $ ər/XXthe shortform of ‘are’Related topics: Religion, SchoolRERE /ˌɑːr ˈiː/ noun [uncountable] British EnglishRRSES (Religious Education) a subject taught in schoolsFrom Longman Business Dictionaryrere /riː/ prepositionconcerning; used in business letters and notes to introduce the subject that you are writing aboutRe: your complaint dated April 8.ReRe /riː/ noun [uncountable]INSURANCEabbreviation for REINSURANCE (=when an insurance company arranges to share a large insurance risk with other companies), often used in the names of reinsurance companiesMunich Re, the world’s biggest reinsurerOriginre-Old FrenchLatin, "back, again"re1(1700-1800)Latin"on the matter", from res"thing, matter"re2(1400-1500)Medieval Latin