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great seal

American  

noun

  1. the principal seal of a government or state.

  2. (initial capital letters)

    1. the Lord Chancellor, keeper of the principal seal of Great Britain.

    2. his office.

great seal British  

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

Etymology

Origin of great seal

Middle English word dating back to 1350–1400

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.