root-mean-square
noun
ˈrüt-ˈmēn-ˈskwer 
ˈru̇t-
: the square root of the arithmetic mean of the squares of a set of numbers
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“Root-mean-square.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/root-mean-square. Accessed 19 Apr. 2024.
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