fiver

noun6

1. •
   (slang) 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. •
   (slang) The value in money that this represents.

   • I bought the chocolates; they were only a fiver.
3. •
   (informal) A clenched fist.
4. •
   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).
5. •
   A mathematical puzzle played on a 5 × 5 grid.
6. •
   A Zaydi Shiite Muslim, who disagrees with the majority of Shiites on the identity of the Fifth Imam.

noun2

1. •
   A Zaidi Shi'a Muslim.

   • The three major branches or sects are the Twelvers, Seveners, and Fivers. — 1998
2. •
   (slang) A fan of the American science-fiction television series Babylon 5.

   • It is more than two weeks that Babylon 5 aired for the last time. We, Portuguese Fivers of conviction, are few. — 1995