Definition of re in English:

re

preposition

  • 1In the matter of (used typically as the first word in the heading of an official document or to introduce a reference in an official letter)

    ‘re: invoice 87’
    about, concerning, regarding, with regard to, relating to, apropos, apropos of, on the subject of, respecting, in respect of, with respect to, with reference to, as regards, in the matter of, in connection with, referring to, touching on
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    1. 1.1 About; concerning.
      ‘I saw the deputy re the incident’
      about, concerning, regarding, with regard to, relating to, apropos, apropos of, on the subject of, respecting, in respect of, with respect to, with reference to, as regards, in the matter of, in connection with, referring to, touching on
      View synonyms

Usage

It is often said that, strictly speaking, re should be used in headings and references, as in Re: Harrison versus Ortiz, but not as a normal word meaning ‘regarding,’ as in thanks for your letter re the job postings. However, the evidence suggests that re is now widely used in the second context in official and semiofficial contexts, and is now generally accepted. Be aware, however, that in certain formal contexts, if re is used in mid-sentence, some readers may regard it as business jargon or an inappropriate legalism. Often, concerning or about would be just as clear (and less likely to annoy)

Origin

Latin, ablative of res ‘thing’.

Pronunciation