Bannister, Sir Roger Syllabification: (Ban·nis·ter, Sir Roger)Pronunciation: /ˈbanəstər/Definition of Bannister, Sir Roger (1929-), British middle-distance runner and neurologist; full name Sir Roger Gilbert Bannister. In 1954, he became the first man to run a mile in under 4 minutes. Bannister, Sir Roger in other Oxford dictionaries Definition of Bannister, Sir Roger in the British & World English dictionary