What is "bondings"

Usage examples of "bondings".

But on Earth they had entered the servitude, so to speak, of biological evolution and only in that context amazed man with subtlety—the subtlety of the complex bondings that combined to form organisms and the interdependent hierarchies of species.

I don't think either of them have any idea how well they mesh, but I've seen a hundred bondings and this is one of the best.

Perhaps their bondings are matters of mathematical or chemical imperative, or for convenience, economic advantage, or even spite.