The definition of a tenner is a slang term for a $10 bill or a 10-pound note in England.
If a pizza costs $10 and you want to ask your friend to give you the money, this is an example of when you might ask him for a tenner.
- a ten-dollar bill
- Brit. a ten-pound note
- Informal A ten-dollar bill.
- Chiefly British A ten-pound note.
- (informal) A monetary note (bill) whose face value is ten basic units of currency.