A single word for the expression "One Thing In Common"?

Question

Is there a single word to replace "one thing in common"? I feel it might appear more professional, to be used say in academic work.
examples:

They've got one thing in common.
They have one common shared foundation.
They have one thing in common—the user experience.

John Smith · Accepted Answer

I finally got down to write this sentence, and it seems more complete to the context as a whole. Thanks a lot, to @rhetorician who provided me with the word: commonality .
My written sentence:

nonetheless, perhaps the commonality they all share is the elements of
user experience.

This is very good indeed.

B.Black · Answer

"Tangential", as in how a tangent line or plane only touches a curve or sphere at a single point?

A single word for the expression "One Thing In Common"?

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