Middle English, from Late Latin Sanctus, sanctus, sanctus Holy, holy, holy, opening of a hymn sung by the angels in Isaiah 6:3
15th century, in the meaning defined above
“Sanctus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Sanctus. Accessed 6 Dec. 2023.
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