Definition of re preposition from the Oxford Advanced Learner's Dictionary

 

re2

 preposition
preposition
BrE BrE//riː//
 
; NAmE NAmE//riː//
 
Email
 
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used at the beginning of a business letter, etc. to introduce the subject that it is about; used on an email that you are sending as a reply Re your letter of 1 September… Re: travel expenses Wordfinderaddress, attachment, compose, draft, email, emoticon, forward, inbox, message, re See related entries: Email
See the Oxford Advanced American Dictionary entry: re