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The system, which he named univalent foundations, was the main topic of study at the Institute for Advanced Study for a year, in 2012–13.

Though it’s known as Siwa today, prior to the fifthteenth century, it was called Ammonium--which probably sounds like a place filled with the univalent chemical ion NH4+ --and it sort of was.

“You are provided with added diversity, which is preparation for unexpected changes. It may give you some adaptability that a stagnant, univalent genome would not.”

Me, I was always just Hazel, univalent Hazel.

Monoxide, mo-nok′sīd, n. an oxide containing a single oxygen atom in combination with two univalent atoms or one bivalent atom.