Synonyms of 're'
usage note:In contexts such as re your letter, your remarks have been noted or he spoke to me re your complaint, re is common in business or official correspondence. In spoken and in general written English with reference to is preferable in the former case and about or concerning in the latter. Even in business correspondence, the use of re is often restricted to the letter heading.
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Thesaurus for re from the Collins English Thesaurus