One of the mysteries of the English language finally explained.
1Finance. A rate of repayment; specifically the annual income from an investment, usually expressed as a percentage of the original investment.
2The fare for haulage or transport back from a place (now rare). Also (now usually): the fare for a round trip.
3The proportion of a particular set of people or things which returns or is returned.
Mid 19th century. From return + rate.
return rate/rɪˈtəːn ˌreɪt/
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