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The Britannica Dictionary
RR
1 ENTRIES FOUND:
RR
(abbreviation)
RR
abbreviation
RR
abbreviation
Britannica Dictionary definition of RR
1
railroad
Turn left at the
RR
crossing.
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2
US
or
R.R.
rural route
◊ The abbreviation
RR
is used in mailing addresses to places that are located in the country to show which delivery route the mailbox is located on.
RR
5, Box 653
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