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English definition of “re”

re

preposition
 
 
/reɪ/ US  /riː/
EMAIL used in the subject line of an email (= line at the top of an email that tells you the subject of the message) to show that you are replying to an email that was sent to you with the same title: The email was titled 'Re: Our Meeting Next Week'.Regarding and concerningLinking and relatingConventions used on the Internet and in email
LETTER used in business letters to refer to a letter or something in a letter you have received and are replying to: Re your communication of 15 February...Regarding and concerningLinking and relatingLetters, notes and cardsPaper and stationery
(Definition of re preposition from the Cambridge Learners Dictionary © Cambridge University Press)
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