Only quantities which have been arithmetically derived by the equation -

P = Sqrt( Sqr(A) + Sqr(B) + Sqr(C) + . . . )

or its equivalents, can properly be referred to as RMS.

Occasionally, when there is something specially significant in the way a
value been calculated, it may be descriptively convenient to precede its
name with RMS.

But use of the term in a non-arithmetical context s meaningless.

The term 'RMS value' is also used in conjunction with other than electrical
quantities, eg., as in Statistics.
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Reg.