An available, unmarried man. 2.) In feudal times, a young knight in the service of an older knight was his sexual partner. 3.) A man who remains unmarried. 4.) [20th century] The code word or euphemism for a homosexual. 5.) In Obituraries in The Times of London, they used the expressions 'he never married' for heterosexual bachelors, and 'confirmed bachelor' as a code for being gay.