R.M.S.

abbr. Math. root-mean-square.

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1. Railway Mail Service.

2. Brit. Royal Mail Service.

3. Brit. Royal Mail Steamship.

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rms.,

1. reams (of paper).

2. rooms.

r.m.s.,

Statistics. root-mean-square.

R.M.S.,

1. Royal Mail Service (of Great Britain).

2. Royal Mail Steamship (of Great Britain).

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Mathematics abbr. root mean square