Meaning of “re” in the English Dictionary

"re" in British English

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repreposition

uk /riː/ us /riː/

renoun [ S ]

also ray uk /reɪ/ us /reɪ/

re-prefix

uk /riː-/ /ri-/ /rɪ-/ us /riː-/ /ri-/ /rɪ-/

're

uk /ər/ us /ɚ/

short form of are:

You're late.

(Definition of “re” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"re" in American English

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repreposition

us /ri, reɪ/

(esp. in business letters) about; on the subject of:

Re your memo July 10, I have indeed received the order.

re-prefix

us /ri/

used esp. with verbs to add the meaning "do again":

reactivate; reactivation; reassess; reassessment; reassign; recommence; re-create; redistribute; redistribution; redraft; reevaluate; reevaluation; refocus; reformulate; reformulation; reinterpret; reinterpretation; reinvest; reinvestment; reoccur; reorient; reorientation

(Definition of “re” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"Re" in Business English

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Renoun [ U ]

uk us

abbreviation for reinsurance : used in the names of companies that deal with reinsurance:

According to its website, Swiss Re is a leading risk carrier and worldwide provider of financial services.

repreposition

uk /reɪ/ us /riː/

COMMUNICATIONS, INTERNET used in the subject line of an email to show that you are replying to an email that was sent to you with the same title. If you reply to an email, this word is automatically added to the reply the person you are emailing receives:

The email was titled "Re: Our Meeting Next Week."

COMMUNICATIONS 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...

re-prefix

uk /riː-/ us

added in front of words to mean "again":

rebranding
reusable

(Definition of “Re” from the Cambridge Business English Dictionary © Cambridge University Press)