Etymology
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usury (n.)

c. 1300, "practice of lending money at interest," later, at excessive rates of interest, from Medieval Latin usuria, alteration of Latin usura "payment for the use of money, interest," literally "a usage, use, enjoyment," from usus, from stem of uti (see use (v.)). From mid-15c. as "premium paid for the use of money, interest," especially "exorbitant interest."

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Definitions of usury

usury (n.)
an exorbitant or unlawful rate of interest;
Synonyms: vigorish
usury (n.)
the act of lending money at an exorbitant rate of interest;
From wordnet.princeton.edu