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great seal

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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.

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
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