Definition of middle ground noun from the Oxford Advanced American Dictionary

 

middle ground

 noun
noun
 
[uncountable]
 
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a set of opinions, decisions, etc. that two or more groups who oppose each other can agree on; a position that is not extreme Negotiations have failed to establish any middle ground. The dance company now occupies the middle ground between classical ballet and modern dance.
See the Oxford Advanced Learner's Dictionary entry: middle ground