Re
Latin, ablative of res ‘thing’.
wiktionary
Borrowed from Latin rē, ablative of rēs(“thing, matter, topic”).
The first syllable of Latin resonāre(“to resound”), the first word of the second line of the medieval hymn Ut queant laxis, from which the solfège syllables were taken because its successive lines started each on the next note of the scale.
re ( uncountable)
etymonline
re
"with reference to," used from c. 1700 in legalese, from Latin (in) re "in the matter of," from ablative of res "property, goods; matter, thing, affair," from Proto-Italic *re-, from PIE *reh-i- "wealth, goods" (source also of Sanskrit rayi- "property, goods," Avestan raii-i- "wealth"). Its non-legalese use is execrated by Fowler in three different sections of "Modern English Usage."
