One of the mysteries of the English language finally explained.
A benevolent spirit imagined as accompanying a person throughout his or her life and exerting a good influence, and often paired with an opposed malevolent spirit.
Early 17th century. From post-classical Latin bonus genius from classical Latin bonus good + genius.
bonus genius/ˌbəʊnəs ˈdʒiːnɪəs/
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