Webster's Revised Unabridged Dictionary · 1913

Genius

Genius , noun

[Latin genius, prop., the superior or divine nature which is innate in everything, the spirit, the tutelar deity or genius of a person or place, taste, talent, genius, from genere, gignere, to beget, bring forth. See Gender, and compare Engine.]

1.
A good or evil spirit, or demon, supposed by the ancients to preside over a man's destiny in life; a tutelary deity; a supernatural being; a spirit, good or bad. Compare Jinnee.
The unseen genius of the wood. — Milton
We talk of genius still, but with thought how changed! The genius of Augustus was a tutelary demon, to be sworn by and to receive offerings on an altar as a deity. — Tylor
2.
The peculiar structure of mind with which each individual is endowed by nature; that disposition or aptitude of mind which is peculiar to each man, and which qualifies him for certain kinds of action or special success in any pursuit; special taste, inclination, or disposition; as, a genius for history, for poetry, or painting.
3.
Peculiar character; animating spirit, as of a nation, a religion, a language.
4.
Distinguished mental superiority; uncommon intellectual power; especially, superior power of invention or origination of any kind, or of forming new combinations; as, a man of genius.
Genius of the highest kind implies an unusual intensity of the modifying power. — Coleridge
5.
A man endowed with uncommon vigor of mind; a man of superior intellectual faculties and creativity; as, Shakespeare was a rare genius.
Collocations (1)
Genius loci , the genius or presiding divinity of a place; hence, the pervading spirit of a place or institution, as of a college, etc.