From Longman Dictionary of Contemporary EnglishSrSr British English, Sr. American English 1 NAME OF A PERSONthe written abbreviation of Senior Douglas Fairbanks, Sr.2 NAME OF A PERSONthe written abbreviation of Señor Sr Lopez3 RRNAME OF A PERSONthe written abbreviation of Sister, used in front of the name of a nun Sr BernadetteFrom Longman Business DictionarySr.Sr. written abbreviation for SENIOR;SNR.Frank Lawson Sr.