n. The ruling or predominant spirit of a place, person, or thing; the power, principle, or influence that determines character, conduct, or destiny (supposed by the ancients to be a tutelar divinity, a good spirit, or an evil demon, usually striving with an opposing spirit for the mastery); that which controls, guides, or aids: as, my good genius came to the rescue; his evil genius enticed him.n. A disembodied spirit regarded as affecting human beings in certain ways, but not as connected with any one individually.n. A type or symbol; a concrete representative, as of an influence or a characteristic; a generic exemplification.n. Prevailing spirit or inclination; distinguishing proclivity, bent, or tendency, as of a person, place, time, institution, etc.; special aptitude or intellectual quality; intrinsic characteristic or qualification: as, a genius for poetry, or for diplomacy; the genius of Christianity, of the Elizabethan period, of the American Constitution, of the Vatican.n. Exalted mental power distinguished by instinctive aptitude, and independent of tuition; phenomenal capability, derived from inspiration or exaltation, for intellectual creation or expression; that constitution of mind or perfection of faculties which enables a person to excel others in mental perception, comprehension, discrimination, and expression, especially in literature, art, and science.n. A person having such mental power; a person of general or special intellectual faculties developed in a phenomenal degree.