[goor-oo, goo-roo]
Hinduism. a preceptor giving personal religious instruction.
an intellectual or spiritual guide or leader.
any person who counsels or advises; mentor: The elder senator was her political guru.
a leader in a particular field: the city's cultural gurus.

1820–30; < Hindi gurū < Sanskrit guru venerable, weighty

guruship, noun Unabridged


("Guru") 1469–1539, Indian religious leader: founder of Sikhism. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
guru (ˈɡʊruː, ˈɡuːruː)
1.  a Hindu or Sikh religious teacher or leader, giving personal spiritual guidance to his disciples
2.  derogatory often a leader or chief theoretician of a movement, esp a spiritual or religious cult
3.  facetious often a leading authority in a particular field: a cricketing guru
[C17: from Hindi gurū, from Sanskrit guruh weighty]

Nanak (ˈnaːˌnʌk)
See Guru Nanak

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1800, gooroo, from Hindi guru "teacher, priest," from Skt. guru-s "one to be honored, teacher," lit. "heavy, weighty," from PIE base *gru- (see grave (adj.)). Generalized sense of "mentor" is from 1940; sense of "expert in something" first recorded c.1966 in Canadian Eng.
in ref. to Marshall McLuhan.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary
guru [(goor-ooh, goo-rooh)]

In Hinduism, a teacher or spiritual leader.

Note: By extension, a “guru” is a teacher who attracts disciples or followers.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Computing Dictionary

guru definition

An expert, especially in "Unix guru". Implies not only wizard skill but also a history of being a knowledge resource for others. Less often, used (with a qualifier) for other experts on other systems, as in "VMS guru".
See source of all good bits.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
She often received standing ovations from mothers and fathers who would line up
  to meet the guru with the bright red hair.
Not many management gurus have their name adopted for a principle, especially
  when they are not really a guru at all.
What the guru says is right if you believe otherwise you are an idiot, is the
  philosophy that governs this pseudo-science.
They now they call me the guru of stunt entertainment chainsaw art.
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