Fiver

noun

1. A banknote with a value of five units of currency.

   "Do you have a fiver I could borrow? I can pay you back tomorrow."

2. (by extension) The value in money that this represents.

   "I bought the chocolates; they were only a fiver."

3. A clenched fist.
4. A mathematical puzzle played on a 5 × 5 grid.
5. A Zaydi Shiite Muslim, who disagrees with the majority of Shiites on the identity of the Fifth Imam.