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Meanings and definitions for NRR

Newport Reading Room, a gentlemen's club in Newport, Rhode Island;
No Reply Required in the subject field of an email;
National Recording Registry The National Recording Registry in the United States;
Non-Repudiation of receipt, a legal acknowledgement of origination/authorship of a document (as per internet RFC4130);
Nuclear Reactor Regulation (Office of Nuclear Reactor Regulation) in the United States;
Net reproduction rate in human fertility;
Nitrogen reduction reaction, the conversion of N2 to ammonia;
Noise reduction ratings in hearing protectors;
National Rock Review an American website for rock music reviews and interviews;
Net run rate in cricket
Roosevelt NAS airport (code), Puerto Rico