What is "co-mingling"

Usage examples of "co-mingling".

Or was that co-mingling now an embarrassment to the mystif, and its assault on the platform a way to reestablish a distance between them?

I had believed his assurances that he was working cooperatively toward a greater understanding between the species, and toward a synergistic co-mingling of knowledge and thought.

Every time we tried some sort of suspension, it was impossible to keep the liquid or gas from co-mingling with the subject and causing problems in the rebuilding.