Charles Buck Theological Dictionary
A good or evil spirit or daemon, who the ancients supposed was set over each person to direct his birth, accompany him in his life, and to be his guard. Genius signifies that aptitude which a man naturally possesses to perform well and easily that which others can do but indifferently, and with a great deal of pain.
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Buck, Charles. Entry for 'Genius'. Charles Buck Theological Dictionary. https://www.studylight.org/dictionaries/eng/cbd/g/genius.html. 1802.