RMS means Root of the Means Squared. It is primarily used in the measurement of non sinusoidal waveforms where the effective value is the norm for pure sinusoidal waves. Both are intended to measure the equivalent heating effect of straight DC so that you have a comparison heating effect.
So an RMS meter takes a sampling of the instantaneous voltages and squares them, adds them together and then takes the square root of the product. Reason for this is that energy responds to the square of the voltage so if you square a large number vs a small number (voltage amplitude) you will have a much larger number but since it isn't continuous, it has to be combined with the other amplitudes.
At least that's the way I remember it and it has been awhile.
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