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proving ground

noun
1.
any place, context, or area for testing something, as a piece of scientific equipment, a theory, etc.
Origin of proving ground
1940-1945
1940-45
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for proving ground

proving ground

noun
1.
a place or situation in which something new, such as equipment or a theory, can be tested
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
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Word Value for proving

13
17
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