genius

[jeen-yuhs]
noun, plural geniuses for 2, 3, 8, genii [jee-nee-ahy] , for 6, 7, 9, 10.
1.
an exceptional natural capacity of intellect, especially as shown in creative and original work in science, art, music, etc.: the genius of Mozart. intelligence, ingenuity, wit; brains.
2.
a person having such capacity.
3.
a person having an extraordinarily high intelligence rating on a psychological test, as an IQ above 140. mental giant, master, expert; whiz, brain, brainiac. idiot, imbecile, half-wit, dope, moron; fool, simpleton, dunce, dullard, dolt; numskull, blockhead, nitwit, ninny.
4.
natural ability or capacity; strong inclination: a special genius for leadership. gift, talent, aptitude, faculty, endowment, predilection; penchant, knack, bent, flair, wizardry.
5.
distinctive character or spirit, as of a nation, period, or language.
6.
the guardian spirit of a place, institution, etc.
7.
either of two mutually opposed spirits, one good and the other evil, supposed to attend a person throughout life.
8.
a person who strongly influences for good or ill the character, conduct, or destiny of a person, place, or thing: Rasputin, the evil genius of Russian politics.
9.
Islamic Mythology, jinn; genie.
10.
genie ( def 3 ).

Origin:
1350–1400; Middle English < Latin: tutelary deity or genius of a person; cf. genus

genius, genus.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
genius (ˈdʒiːnɪəs, -njəs)
 
n , pl (for senses 5, 6) -uses, genii
1.  a person with exceptional ability, esp of a highly original kind
2.  such ability or capacity: Mozart's musical genius
3.  the distinctive spirit or creative nature of a nation, era, language, etc
4.  a person considered as exerting great influence of a certain sort: an evil genius
5.  Roman myth
 a.  the guiding spirit who attends a person from birth to death
 b.  the guardian spirit of a place, group of people, or institution
6.  (usually plural) Arabian myth a demon; jinn
 
[C16: from Latin, from gignere to beget]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

genius
late 14c., from L. genius "guardian deity or spirit which watches over each person from birth; spirit, incarnation, wit, talent," from root of gignere "beget, produce" (see kin), from PIE base *gen- "produce." Meaning "person of natural intelligence or talent" first recorded 1640s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It became the skill that separated him from other computer geniuses and
  business leaders.
Most of history's industrial geniuses have similar stories.
The music business is full of crazy characters and maniacs and drug addicts and
  geniuses.
There are a lot of geniuses in the world, and a lot of aesthetes.
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