A banknote or coin worth ten units of currency, commonly used as slang for a ten-pound note or ten-dollar bill.
From English 'ten' plus the diminutive suffix '-er', following the pattern of similar currency slang terms. It became common in the 19th and 20th centuries.
British slang for money is incredibly creative—a 'tenner' (ten pounds), a 'fiver' (five pounds), and historically a 'guinea' (21 shillings)! The word shows how language evolves differently in different English-speaking countries.
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