fiver

noun
  1. 1

    A banknote with a value of five units of currency.

    โ€œDo you have a fiver I could borrow? I can pay you back tomorrow.โ€

  2. 2

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

    โ€œI bought the chocolates; they were only a fiver.โ€

  3. 3

    A clenched fist.

  4. 4

    A mathematical puzzle played on a 5 ร— 5 grid.

  5. 5

    A Zaydi Shiite Muslim, who disagrees with the majority of Shiites on the identity of the Fifth Imam.

  6. 6

    A person who gives five percent of their income or five hours a week of their time to charity (a reduction of ten percent tithing).

Source: https://en.wiktionary.org/wiki/fiver