bonusbonus

Bonus comes from Latin bonus ‘good’, from Old Latin duonus, from Proto-Italic *dwenos, of uncertain origin.

1. Proto-Italicc. 1500–700 BCE*dwenos¹‘good’reconstructed
2. Old Latinc. 700–75 BCEduenos¹‘good’
3. Old Latinc. 700–75 BCEduonus¹‘good’
4. Latinc. 75 BCE–200 CEbonus¹‘good’
5. Englishearliest quotation 1949bonus¹

1. ¹ Wiktionary, English bonus
2. Earliest quotation in Wiktionary’s entry: 1949, Land Values Research Group: “In its adherence to a system of rating which…”.