[ uh-poh-nuh n-see ]
/ əˈpoʊ nən si /
an act or instance of opposing.
the state of being an opponent.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for opponency
We have no means of checking them with regard to opponency, and the University was probably in the same position.The Grey Friars in Oxford|Andrew G. Little