tertium quid
noun
ˌtər-tē-\
Definition of tertium quid
1 : a middle course or an intermediate component where there are two systems of law and two orders of courts, there must … be some tertium quid to deal with conflicts of law and jurisdiction— Ernest Baker
2 : a third party of ambiguous status there was a man and his wife and a tertium quid— Rudyard Kipling
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