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One of the major schools of Buddhism, active especially in Tibet and Japan and emphasizing esoteric teachings and tantric practices as a means to enlightenment.
[Sanskrit Vajrayānam : vajraḥ, thunderbolt (considered in Hindu and Buddhist tradition to be made of an indestructible substance like diamond), diamond, Buddhist ritual implement representing the irresistible force of the thunderbolt and the indestructibility of diamondakin to Avestan vazrō, mace, Greek agnunai, to break, Hittite wāki, he bites) + yānam, vehicle; see ei- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Buddhism) a school of Tantric Buddhism of India and Tibet
[from Sanskrit: vehicle of the diamond or thunderbolt]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014