WordReference Random House Unabridged Dictionary of American English © 2025
rms, 
  1. Mathematics(often cap.) See root mean square. 
Also, r.m.s. 
R.M.S., 
    1. Railway Mail Service.
    2. British TermsRoyal Mail Service.
    3. British TermsRoyal Mail Steamship.

Collins Concise English Dictionary © HarperCollins Publishers::
rms
  1. root mean square
'rms' also found in these entries (note: many are not synonyms or translations):
RM - root mean square

Forum discussions with the word(s) "rms" in the title:


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