a foundation of common interest or comprehension, as in a social relationship or a discussion.
Origin of common ground
First recorded in 1925–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
an agreed basis, accepted by both or all parties, for identifying issues in an argument
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
Shared beliefs or interests, a foundation for mutual understanding. For example, The European Union is struggling to find common ground for establishing a single currency. [1920s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.