[UK and ANZ] by return (of post), ANZ also by return mail [noun] [C]She answered my letter (UK and ANZ) by return (of post)/(ANZ also) by return mail (= She sent her letter in the first post collection that left after she got my letter).(US) Returns are the results of voting in an election.Returns are also goods that have been taken back to the shop where they were bought by customers who do not want them because they are damaged or unsuitable.
RETURN
Meaning of RETURN in English
Cambridge English vocab. Кембриджский английский словарь. 2012