The ratio of earnings or profit relative to an investment or business (rate of return); a measure of profitability.
この投資信託は過去5年で平均収益率が年5％だった。
This mutual fund had an average rate of return of 5% per year over the past five years.
企業は売上高だけでなく、収益率を改善するためにコスト削減を進めている。
Companies are cutting costs to improve profitability, not just sales.
株式の価格収益率（PER）は、株価と収益率の関係を示す指標だ。
The price-earnings ratio (PER) is an indicator showing the relationship between stock price and earnings.