/ ˈbəʊnəs; NAmE ˈboʊ-/ noun ( pl. -es )
1.
an extra amount of money that is added to a payment, especially to sb's wages as a reward :
a £100 Christmas bonus
productivity bonuses
2.
anything pleasant that is extra and more or better than you were expecting :
Being able to walk to work is an added bonus of the new job.
—see also no-claims bonus
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WORD ORIGIN
late 18th cent. (probably originally Stock Exchange slang): from Latin bonus (masculine) good, used in place of bonum (neuter) good, good thing.