(plural perfect unisons)
Most of the time, a perfect unison is called a unison, so unison is more common.
"perfect-unison." YourDictionary, n.d. Web. 22 March 2019. <https://www.yourdictionary.com/perfect-unison>.
perfect-unison. (n.d.). Retrieved March 22nd, 2019, from https://www.yourdictionary.com/perfect-unison
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