meeting ground

The basis of any argument about colour must be some sort of convention of this kind to form a common meeting ground.

The two boys were interested in archery, and had brought their apparatus to this accepted meeting–ground for a trial of skill.

His rare references to his own emotions made the old, cousinly intimacy a frequent meeting-ground.

They seemed to have no common meeting-ground, yet, while he constantly startled and shocked, he also fascinated her.

Explanations and appeals had failed; they had tried for a common meeting-ground, and had only made each other unhappy.