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grand masteror grand·mas·ter (grănd′măs′tər)
1. A chess player regarded as having the highest level of ability.
2. A person of the highest competence or achievement in a field.
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.
(Government, Politics & Diplomacy) the title borne by the head of any of various societies, orders, and other organizations, such as the Templars or Freemasons, or the various martial arts
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. a chess player in the highest class of ability.
2. any person at the highest level of achievement.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.