R-o definitions

The eighteenth letter of the English alphabet, called ar and written in the Latin script.
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The ordinal number eighteenth, derived from this letter of the English alphabet, called ar and written in the Latin script.
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(US politics) Republican.
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(film certification) Restricted.
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Right (as opposed to left)
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(handbells) Ring.
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(chess) Rook.
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(baseball, cricket) The statistic reporting the number of runs scored by a player.
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(medicine) Rule out: used to indicate that a certain possible diagnosis should be considered, and appropriate tests performed to rule it out.
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