A bachelor is an unmarried man, from the old French word "bachelor".
(The) Bachelor may also refer to: "Confirmed Bachelor" was a standard euphemism for a homosexual commonly used in U.K. obituaries and publications, especially before 1967, while homosexuality was criminal and its imputation to a living man was unprintable and criminally libellous.
The phrase is still in use ironically, for example, in satirical magazines.