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great seal

noun
  1. the principal seal of a government or state.
  2. (initial capital letters) British.
    1. the Lord Chancellor, keeper of the principal seal of Great Britain.
    2. his office.
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Origin of great seal

Middle English word dating back to 1350–1400
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for great seal

great seal

noun
  1. (often capitals) the principal seal of a nation, sovereign, etc, used to authenticate signatures and documents of the highest importance
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012