I can't find a simple definition via google. All I get are research papers, that I don't understand.
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I'm pretty sure it just means the charge of the ligand is -1.
https://en.wiktionary.org/wiki/unipositive
Cyanide qualifies, ETDA does not.
Anyway, the word is on its way out. "Monoanionic" seems to be more popular.
