fiver

Pronunciation: /ˈfaɪvɚ/

The English word “fiver” has 6 meanings listed here.

noun

A banknote with a value of five units of currency.
The value in money that this represents.
A clenched fist.
A mathematical puzzle played on a 5 × 5 grid.
A Zaydi Shiite Muslim, who disagrees with the majority of Shiites on the identity of the Fifth Imam.
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).

From five + -er (measurement suffix) or + -er (“supporter”).

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.