Pronunciation (UK) IPA (key): /ˈbəʊ.nəs/ (US) IPA (key): /ˈboʊ.nəs/ Audio (UK)(file) Noun Singular bonus Plural bonuses (countable) A bonus is something extra or more that is added. John got a bonus because he played very well.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads