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The root-mean-square value of an alternating current or voltage. It is the
square root of the mean value of the squares of the instantaneous values
taken over a complete cycle. When an alternating current or voltage is
specified, it is almost invariably the root-mean-square value that is
used. Also used of quantities that alternate over longer periods, for
example, a month or year. Also known as effective value. Abbrev., R.M.S.
CTD
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