gen·ius

[jeen-yuhs]
noun, plural gen·ius·es for 2, 3, 8, gen·i·i [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. 2013.
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Genius is always a great word to know.
So is ninnyhammer. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a fool or simpleton; ninny.
Collins
World English Dictionary
genius (ˈdʒiːnɪəs, -njəs) [Click for IPA pronunciation guide]
 
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
More's genius is of that high order in which the intellectual and moral powers
  seem to interpenetrate and vitalise each other.
All the writers discussed here are interesting from an historical viewpoint,
  but only some reach the peaks of genius.
However, the brilliance of genius always keeps as many polar belief options in
  their library as possible.
What you don't consider a brilliant idea, because it's your own, someone else
  will be amazed and wonder at your genius.
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