Re Definition
In response to.
Origin of Re
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Identical to re (“regarding”), via its specialized use in business correspondence, from Latin rē, ablative of rēs (“thing, matter”).
From Wiktionary
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Not an abbreviation for response or reply (though some localizations of email software have taken it that way).
From Wiktionary
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Latin rē ablative of rēs thing rē- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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Middle English from Old French from Latin re- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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Middle English from Medieval Latin gamut
From American Heritage Dictionary of the English Language, 5th Edition
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From Latin re.
From Wiktionary