Meaning of “bonus” - Learner’s Dictionary

bonus

noun [ C ] uk us /ˈbəʊnəs/
MONEY

B2 an extra amount of money that you are given, especially because you have worked hard:

All employees received a bonus of £500.
SOMETHING PLEASANT

B2 another pleasant thing in addition to something you were expecting:

The sunny weather was an added bonus.

(Definition of “bonus” from the Cambridge Learner’s Dictionary © Cambridge University Press)